And it does have a yellow barrier around it.
Yes, a yellow barrier 1 foot high. Not enough to matter.
So he doesn't really describe the refraction or explain why that refraction should produce a result exactly like that which we should expect on a concave Earth. Also, the second sentence is a complete non-sequitur.
He DOES explain it in post #20. And his second sentence is not a non-sequitur.
Anyway, we have given you multiple pieces of irrefutable evidence - some of which was personally gathered by forum members - that the Earth is NOT hollow, and that we do NOT live inside of it. Unless you can refute these pieces of evidence (sun rising and setting, satellite observations, Belt of Venus after sunset/before sunrise, seismic wave propogation, horizon observations, etc.) then there is no point in continuing to talk. You asked for proof, we gave it. Either refute our proof or accept it.