“I’ve seen it first-hand” isn’t significant evidence because the frequency illusion effect is a thing. If you see dozens of ads a day and ignore them unless you notice them matching something you talked about, you’ll end up thinking ads can track what you talk about whether or not it’s true.
By “Sam Altman said” in a “series of posts”, this article means these two tweets from 10 hours ago: https://twitter.com/sama/status/1876104580070813976.
This is a screenshot of a tweet talking about an article written about two tweets by Sam Altman. Is this really the world we’re living in, now?