The video you linked is good but summarizes another youtube channel which is better (he links it I think).

I recommend watching all of the videos on the other crater earth channel chronologically.

He ends up adjusting his theories over time with new info so not everything in the early videos is "definitive."

There's SUCH AN INDUSTRY wr to flat earth. That's a CLUE. That means SOMETHING is going on, and "flat earth" is a clever distraction.

Crater earth on a larger (round!) planet checks a disturbing number of boxes. I'm obsessed with this theory atm, I find it fantastically elegant.