[DwnVoteHoneyPot]

Google has a "right to be forgotten" process: https://support.google.com/legal/answer/10769224?hl=en

I have used it before and Google responded and removed the links to the offending chat forum. If it doesn't show up in Google it's unlikely any employer will find it.

Also, I'd contact the social media companies directly too. At minimum, you could ask for your name to be removed. Doxxing is usually not allowed on their services. Took much more time and persistence than Google, but I was able to get the chat forum to remove names. Best response if you contact their legal dept., not their customer support. You can find legal contact in Terms of Service, Privacy Statement, financial statements, press releases etc.

[abathur]

Along these lines, unless you have good sense that the accusation and discussion about it are both indelible and preserved in sources that are insurmountably-well-ranked, consider whether you can stomach living the life of a content-producer for a while. Blog, youtube, or tweet. Restrict the comments/replies.

It's a chance to simultaneously show/model your real values, and dilute the influence of the accusation.

Also: don't curdle.