Nowhere close. There are several things going on. The equipment prices have been climbing steadily for several years as the electronics get more sophisticated. The installation is a lot more complex as cars keep getting more sensors and other features. EVs can bring additional complexity, such as the Tesla Plaid not having any circuits that shut down completely when the car powers off. (Several years ago these installs took 1-2 days. The last two have taken a full week.)
The install for the 2015 Tesla was around $4,000. The 2018 Honda Odyssey install topped $5,000. The Tesla install last August was just over $8,000. The Lucid edged past $10,000. (The primary difference between the Plaid and the Air is that I opted to add rear laser sensors on the Air. Police seldom fire lasers from the rear on surface streets and most often do so from overpasses on interstates, and we plan on using the Air for longer road trips instead of the Tesla.)
I'm not as crazy a driver as all this might suggest. But EVs -- and the Air moreso than any other I've driven -- can accumulate speed so quickly and so quietly that it takes constant vigilance not to hit high speeds. I don't use radar detectors as a means to drive dangerously with impunity. I use them to give me a warning when the speed at which I'm driving comfortably on open highways or in the flow of high-speed traffic might still get me singled out for a ticket.