Did you read his FE book? He spent a significant amount of time defending the integrity of NASA.
Now that is cringe.
I'm sure about few things, as much as I'm sure that NASA is a fraud. I've seen them caught in WAY too many lies to have any trust for them. "Fool me once, shame on you. Fool me twice, shame on me."
Regardless of the shape of the earth, I'm 100% certain that NASA is completely deceptive. The moon landings are only the beginning of it.
Thank God for people like David Weiss and other Flat Earthers who, despite their flaws, have done God's own work in exposing NASA's lies and deception. And no, it doesn't require trusting them. Just look at the evidence! It speaks for itself. You don't have to trust these characters. They are just leading you to water. You make your own conclusions -- which are inescapable, I might add.
All these Flat Earthers do is ask the right questions, demonstrate evidence, connect the dots -- and gently help you to draw the right conclusions. You're free to disagree, if they're illogical. But they're not. The evidence is always indisputable. They do an EXCELLENT job making their case, 99% of the time.