Here's another video about the crop circle phenomenon. He also mentions the Flat Earth topic.
Crop Circle Theorist Thinks The Truth Is Out There
Yeah, I actually came across this one first. I think the other video is way, way more comprehensive and researched. This guy is just saying what he believes. No real facts.
Also yes, he mentions flat earth when talking about what skeptics say to him. His response:
"05:43 people do say oh you're just a flat earther and I go no I'm not I don't believe that but you know that's the way."