Other than listening and arguing in relatively good faith I don't think HN is a bubble, although such people probably have pretty different opinions than the typical person simply because they listen and change themselves more so it gets more refined.
A bubble in this context has the connotation of ignorance of what is outside the bubble.
I'm very delighted that I bought GOOGL stock at $95 when it fell after everyone panicked at their Bard demo a year ago. [0]
Everyone wants their shares to go up, more growth, which can then lead to questionable actions on their part. Did you see the recent article about search enshittification (tldr; to make key metrics go up, make search worse so that users have to make more queries to get what they want)?