he admits in the article to having equity via his investment fund, they are using semantics because he doesn't "personally" have equity. He also tries to downplay by saying it's an "immaterial" amount, but in reality that could be billions of dollars.
There's also nothing preventing Microsoft from gifting him billions in Microsoft stock so they can claim he's not motivated by profit with OpenAI despite indirectly making money off it.
You'd have to be extremely naïve to look at the decisions he's made at OpenAI and think it was all purely out of good will. Google and AWS both offer credits for academic and charity projects, why did Altman choose to go all in with Microsoft if it wasn't for money?