Otherwise, the best way I can describe it is that he believes most of what NASA puts out except with a geocentric and young earth flavor.
I recall an interview he gave about his book. He did agree that NASA has put out some obvious hoaxes, and so decided to prescind from arguing on the basis of any NASA "evidence". He also did dismiss some of the facile anti-FE arguments, such as "if the earth is flat, why can't you see Europe from the US East Coast?" He agreed that the atmosphere would make it impossible to see that far. So I detected a fair bit of intellectual honesty. I have not had a chance to read his book about FE. He did also say that he started out believing he could dispatch FE with a few pages but then conceded that FEs have some very strong and very solid arguments, and that he ended up having to write a several-hundred page book. This is what I've been pointing out all along as one of the main reasons that FE is spreading. There is some really solid evidence in favor of FE to be dismissed lightly. Simple derision and a wave of the hand does not suffice to make those problems simply go away. That and also the arrival of the Nikon P900 camera, where many people could suddenly perform experiments themselves, and they kept finding the same results. P900 went on the market in early 2015, and it's in 2015 that Dubay's videos started to make the rounds. Marion asserted that it was a psy-op to discredit geocentrism since Sungenis had tricked some Jew into appearing on the program. Of course, he had zero evidence to back that up ... just pure speculation. FE was not invented in 2015 to discredit Sungenis. It's been around a very long time, from some Church Fathers, through a resurgence in 19th century England, to the original Flat Earth Society (which has now been co-opted). And it does really square with the fact that Big Tech have been aggressively attempting to suppress it.