Yep. The seats all fold down to roughly the same level. But to get a truly flat space (
i. e., without significant gaps) you have to put two panels in place: one over the second/third-row gap and one over the third row seats.
Here is the cargo area without the panels:
View attachment 27271
And here's the gap between the second and third row:
View attachment 27272
And here's the panel that has to be removed to fold the third row and then replaced to flatten the space:
View attachment 27273
Here's Kyle Conner removing the panel before dropping the third row seats into the cargo footwell:
View attachment 27274
My point of reference for ease of use is our Honda Odyssey minivan which provides a truly flat cargo space with no panels required. Its third row seats drop into the rear storage well, with the seatbacks themselves forming a flat surface level with the top of the rear bumper. So no panel there to remove and replace. However, to get the flat floor in the whole cargo length, the second row seats (which are very heavy) have to be removed completely from the van and stored somewhere -- a real chore and massive inconvenience.
On balance, I much prefer the Lucid solution. It's a lot easier to fool with a couple of lightweight panels to get a flat floor than to remove seats.