So the hole was created by too much sunlight.
Wait, so let me get this straight. The hole was created by too much sunlight in a place where the sun doesn't shine for a fourth of the year and for another fourth where it is significantly less intense? I see nothing wrong with that logic. Also, in regards to your post where you said it can't be human causes because there are no human settlements there - I don't know if you know this but the atmospheric gases do
move.
And there are settlements
Think about it like this. If you fart, does the fart stay right next to your butt and no one can smell it unless their nose is right next to your butt? You're saying that's the case.
Also if it were caused by too much sunlight, the ozone layer would be thinned out everywhere
except the poles - especially at the equator which it's
not (well, it is significantly thinner across the entire planet but not to the degree as the southern pole).