If you're a top-tier AI researcher, why TF would you choose Tesla to work for? The shine has gone off Musk as a super-genius. All you'd be getting is an arbitrary, capricious boss and terrible work hours.
I also (personally) know of several non-ML offers that were substantially higher than FAANG. Though even within FAANG only Meta and maybe Google (and Amazon at hogher levels) are very competitive. Meta and Google likely have better growth prospects though with better refreshers, bonuses, stock growth, etc. But up front Tesla AI offers are definitely very strong. Even then I'm not sure its worth the stress.