1. The kind of person who buys a sports-car often doesn't want the "base version". They want luxury. They want status. They don't want to face the choice of being upsold to an impractical deathtrap or driving around in the "base version" like someone who could barely just afford it.
2. This demo does absolutely nothing to demonstrate the abilities of the base version. I reiterate, a brick could have been made to fly in this way. The base version will no doubt have good paper stats because Musk understands that numbers must be big, but that doesn't mean the base model will be pleasant to drive.
3. The styling of this car is "wankpanzer with a few extra polygons". Given how well the wankpanzer sold, demand for this thing, even if the base model is a competent auto, will be limp.
4. Musk is currently trying to buy another election. With Musk visibly taking an interest in Tesla again, that's likely to backfire on Tesla. They need to cut ties with Musk, not keep doing the sort of puerile things he's known and frequently lambasted for.