Just FYI, Seeking Alpha is a forum for many investors with short positions on Tesla. They have been predicting Tesla's demise for a decade.
It's so high because it's the future, not because of current sales. If it's the future then the argument needs to be a little different if your hoping to convince people to dump it.
What remains to be seen is whether those beliefs are correct. It's not unheard of for stocks to.fly high because of what people believe the future will bring, and then to come down when that prediction turns out to be false.