It’s not really surprising when anyone pushing crypto to you also happen to hold a lot of crypto. It’s self-serving advice 100% of the time. It’s pretty much a staple also to call every other crypto you don’t hold a fraud trying to steal the spotlight.
While it may well be self-serving, this is also a near tautological statement, as you'd expect someone who pushes crypto to also hold a lot of crypto if they genuinely believe in it - whether for sound reasons or not. As such the fact they're holding crypto tells us nothing about whether they're pushing it because they're holding it or pushing it because they believe in it.