This information is publicly available on the CCPA and GDPR websites. There are exceptions to erasure. Forum comments are not one of them. Hacker News is in violation of both the CCPA and the GDPR.

The only way that comments you submit have personal information is if you include it. If you do so and want specific comments edited or deleted, I have complete faith the staff at HN will assist with that.

The rules, which you seem to think don't apply to you, for HN include:

"You acknowledge and agree that any questions, comments, suggestions, ideas, feedback or other information about the Site (“Submissions”) provided by you to Y Combinator are non-confidential and Y Combinator will be entitled to the unrestricted use and dissemination of these Submissions for any purpose, without acknowledgment or compensation to you."

Arbitrary forum comments do not contain information linking the comment to a real person which is what the CCPA and GDPR require in order for action to be taken.