Okay this isn't Delivery Discussion related, but I don't think they put in "considerable" engineering hours here. At the 0:38 mark of
this video, Marc mentions Derek Jenkins came to him with the idea for the GX about three months ago.
Regardless, as others have said, I think this is a good move on Lucid's part. It's about marketing and it helps raise brand awareness. In parallel to building brand awareness, they need to work on software and manufacturing prowess. Very similar to Tesla circa 2012-13.