Not the same at all. For that to happen you would have to explicitly visit their channel (forgive incorrect terminology, I don't use youtube). If someone kept posting on hackernews asking you to subscribe I hope you wouldn't appreciate it. swillison is spamming a communal public feed with self promotional comments about vibe coding, quite obviously because they, like the rest of us, are panicking about not having a career in a few years.
The more time I spend actually working with these tools the less I fear for my future career.
Building software remains really hard. Most people are not going to be able to produce production quality software systems, no matter how good the AI tooling gets.
Forums traditionally included signature blocks at the end of messages. If someone linked his youtube channel there would that be objectionable? Assuming the preceding message was on point of course.
Posts on HN are analogous to videos on youtube. A channel is analogous to an HN user profile.