The most convincing argument that elon does a lot of cocaine is just listening to him speak in a less formal interview.
BUT! I don’t think he used to be actually smart, just lucky. Too many people assume “succesful” people had to have done something exceptional to earn it, but 99% of extremely wealthy people acquired that extreme wealth through a simple combination of luck and startup capital (which of course they have because they are lucky).
They are talking about karma as a thing you could collect, point totals for all posts added together displayed on your profile. Not the voting mechanism itself.