This is honestly some rather bizarre proof of him being an engineer. It reads like fan letter that uses tweets as the sole evidence. This quote is gold:

> One of the core takeaways I got from him about himself was that he was an engineer more than anything else (career wise), and I agree with that.

I don't really care if he's a "real" engineer or not, but this actually makes me think he likely isn't if that's as good as it gets.