As far as I know, no one from Lucid ever said any such thing. In fact, several videographers over the months asked senior people such as Eric Bach, Derek Jenkins, and David Lickfold about a higher-performance version of the Gravity, and they were always met with sort of smirking dodges instead of any denials, something that always kept my hopes alive.
What happened was that Lucid's long silence on the matter beyond what was on the show circuit caused many of us here, myself included, to speculate (or worry, in my case) that the Dream Edition might have fallen by the wayside. But a lot of that was driven by recollections that they led with the Dream Edition on the Air launch and confusion about why they were not doing so on the Gravity launch.
As it turns out, I think
@borski was right that the timing decision had more to do with pricing publicity this time around than production plans.
Maybe they never said it to you, but they said it to my face on 2 occasions as I was looking over a show model that had the badging. Once at the headquarters. But, yeah, they've said a number of things that represent more "current plans" and lack of pass-down than specific guarantees, so take my 2 data points with a grain of salt. Still, I was not surprised to hear that. I asked "is there going to be a DE", already pretty much knowing what their answer would be through information garnered from other sources.
Smirking dodeges - as in a performance or sapphire version. Those were smirked about as happening down the road, not references to a potential DE which would be a launch model or which was already being designed with an intent to ship as one of the first shipments. The videographers were asking about future plans.
In fact, it is likely that what is now the DE was really just them advancing the time frame on the P/S versions that they were planning all along. The presence of the DE badges and the "maybe in the future" smirks are still no evidence on when they started work on the performance drivetrains. Other than those with internal conversations, the only conclusion from the DE badges followed by no DE's on the initial order pages, combined with how fast they updated the available DE configs based on customer feedback, that kind of external evidence would be consistent with them deciding to bring forward a future P drivetrain and call it a DE only recently.
But, the discussion here was more about "how fresh, new, planned, or cobbled is the DE drivetrain". To that I can easily believe that they already had at least an idea of how to put a P drivetrain into the Gravity for an eventual P/S version, and possibly some prototypes already being tested. But, "seeing DE badges on the road show circuit" is still not really any evidence that they had planned these DE deliveries with a specific drivetrain in any specific time frame.
My guess as to the progress was:
11/23 - we have the new cars ready to be looked at, are we doing DE? Should we put DE badges on them? Who knows? Let's do it!
11/fall - GT and T mechanicals all working as intended? Time to open up orders.
11/24 - what's our launch process? No DE? OK, put up orders for just GT and pre-announce T
11/whenever - eventually we'll want P and maybe S? Now that we have GT/T worked out, let's work out what a high performance drivetrain might be
2/25 - it's taking a really long time to get volume on GT and T, meanwhile those P drivetrains are pretty far along in development. Hey, let's go ahead and use them for a DE.
3/25 - why aren't more people upgrading to DE? Oh, range hit from big wheels? Let's offer DE with base wheels then!
Basically, the development of the higher power drivetrains was always going to happen. It was originally planned for down the road as a specialty variant after GT and T were taking over the market. The presence of DE on the unveil models was mostly just a guess at the marketing and not any indication of how the launch would go (in particular, the actual launch itself didn't originally involve a DE), and the possibility of a performance drivetrain was already pretty much assumed it would eventually happen, but the DE badges there weren't really an indication that they were already designing that drivetrain. What we see as the DE now is basically just bringing forward the P drivetrain as an early adopter incentive.
Has it been in development since the GT was starting design? It was probably expected since then, but active development? The DE badges don't really tell us anything there.
Has it been in development since before they announced DE last month? Maybe, probably, possibly not. Again, DE badges in 11/23 are no indication of that.
Internal knowledge gained from talking to the development team? Yes, that would be a pretty solid indicator of how long they have been working on the drivetrain that will appear in DE.
But, the "DE badges on the initial unveil" have a dubious history of whether or not they predict it would even exist, much less whether they imply the actual development of its drivetrain.