Ozone may have contributed to the cooling of Antarctica, but I think that we need to understand all of the processes first, before we say things with absolute certainty.
I think that if you demand that we say things with absolute certainty, then you risk the logical collapse to solipsism
, the idea that only one's own mind is sure to exist.
If you want to live in the world, you need to find a way to say things with not absolute certainty, but to the best of our scientific understanding.
Stratospheric Temperatures have started increasing recently (since 1995) which could represent a recovery in the Ozone Layer (Liu and Weng 2009
With reference to your comment above about stating things with absolute certainty: Did you know that the RSS measurement of the Temperature of the Lower Troposphere is still decreasing?
I also think that Ozone Depletion is far more complicated than what most people make it out to be. Anthropogenic CFCs had played a major role in Ozone Depletion, but there were also major natural components like Solar Proton Storms that also depleted the Ozone layer.
Also, for the deep Antarctic, stratospheric cooling contributes, because that causes de-nitrification.
I think that most of the warming in the Arctic is probably due to regional climate change up there amplified by Arctic Amplification, but you can not deny that natural variability has played a significant role in Arctic Sea Ice depletion. Various studies that I have read estimate the contribution from natural variability to sea ice decline to be around 40-50% or so.
I think that the various studies that you are reading are not mainstream science. Have you checked the number of citations?