To add to both your posts, a pretty good general rule is: don’t confuse famous with knowledgeable.
The only knowledge they’ve proven is of “how to become known in a specific domain”, which at least in social media is mainly about self-promotion (and more generally it’s about grifter skills) rather than specific domain knowledge.
So yeah, the likes of Andrew Tate will do it by looking confident whilst telling tons of bullshit and plenty of female influencers will do it by looking good and showing some skin - they’re good at self-promotion online but that doesn’t mean they know shit about anything else.