You literally cannot buy FSD without being told that it needs driver supervision. It also tells you that every single time you enable it and it's constantly nagging to you when you take your hands off the wheel aswell as if you're looking at your phone etc. and given enough warnings the system locks you out of it.
Has Musk been dishonest/misleading about it's capabilities in the past? Yes. Is there a single Tesla owner with FSD who doesn't know the truth? No.