I think Hikaru’s fans made him take an IQ or intelligence test a couple of years ago and it showed he wasn’t exactly a mastermind. He said at the time something along the lines that being good at chess shows you are intelligent only in that one domain of chess-type thinking, not general intelligence.
I used to watch a lot of his streams/videos, but I always thought he was just not taking himself seriously, being entertaining, "memeing and trolling". I thought it was his strategy to do unfiltered ADHD thoughts even when they don't make any sense, because that's what brings him viewers.