It might be cynicism, but "I educated myself and others on Google's budget, and left at the perfect time to grab some AI investment cash with the expertise I gained there" feels more likely. Perfectly reasonable move, but why not just say it?
Do you assume he did not produce anything valuable at Google while working there ? (That's entirely possible, but not certain.)
As the old joke goes:
A: "What if I train them, and they leave ?"
B: "Sure. What if you don't train them, and they stay ?"Oh - I'm not saying that. I assume he did, but was also paid to do that.
I'm more commenting on the marketing, rather than the person.
That’s been the Silicon Valley way ever since 1957 when Fairchild Semiconductor was started by the “traitorous eight” who later jumped ship again to found companies like Intel and AMD.