This is a great take. The advent of AI and it's coming to prominence lately I am certain will result in a lot of old blackhat SEO methods becoming obsolete, and hopefully, "SEO" will finally become what it should be originally - not a method to "boost" your site, but a method of a search engine optimising itself to deliver the most appropriate content based on a user search.
The best thing any forum can do to fit these kind of criteria is to simply have accessible, crawlable threads with seo-friendly URLs and ensure any spam content is dealt with quickly to avoid any potential ranking penalties. That's about it, nowadays, and that's a good thing, because it means content should eventually win out.