He's not perfect, but behind the scenes he's a genuine and upstanding person. I've met lots of wealthy smart people, and he's the only exception. He was the only person I trusted in this situation, and I'm genuinely nervous that he's no longer running OpenAI.
But as a general point, you can be both a "good person" and still do bad things. Or you can be a good person in some areas, and a not-so-good person (or even horrible person) in some other areas. People are complex.
Of course it's entirely possible that Altman is just a really good person, but I wouldn't be quick to make assumptions.
This works in two directions, by the way. In 2001 few would have expected that Bill Gates would spend much of his time on philanthropy. Is he a "good" or "bad" person? Well, he's both.