AGain, half truths. They do the math completely wrong. This entire Youtube site is by a geodetic surveyor. Their entire job is to measure the curvature of the earth. Basically everything you see on a map has been mapped and surveyed by a geodetic surveyor. He points out the correct math, and how the things that you see in the distance are at the correct distance behind the curve if you do the math correctly.

And you can see things go over the horizon. You just won't find them on flat earth videos. You have to look at videos that debunk flat earth videos where they show you the things that actually do go over the horizon. Here's a really good one where he shows that exactly the right amount is below the horizon that can't be seen.

This one is excellent because he ALSO shows that what we are seeing would be very different if we were on a flat plane. I can show you tons of videos that show things below the horizon, exactly where they should be when you do the math correctly.