I also don't understand the attacks on his academic credentials. He had been working in his field since he was 13, he's published in CS, and he was taking graduate level classes at Harvard as an undergrad before he dropped out to found Microsoft. So yes, he has spent decades studying a field. The man is unarguably a credentialed engineer, and anyone in this field should know that you don't need a B.S. in CS or a PhD in C.S. for that.
I think it is reasonable to think that bill gates has some idea what he is talking about, especially because in this case he is essentially saying 2+2=4. Still, he is not the definitive authority on crypto.
When he made billions in a society which values making billions above (almost) everything else