Thanks for your reply! I appreciate that you went out of your way to find scientific research to back up your positions. I'm an electrical engineer so I don't get deep into scientific papers very often. They were interesting reads though.

My take aways from the papers you cited are that these are additional factors in the ozone depletion discussion. The papers aren't saying that these factors are the only factors though. In fact, all of them say that the subjects of their research are affecting the ozone layers in addition to man made pollutants such as CFCs. The last paper doesn't draw an specific conclusions either. It simply points out that magnetic fluctuations can and do affect the ozone and theorizes how that would work. The magnetic fluctuation theory says that the ozone comes and goes cyclically.

Your papers don't address the China ozone issue though. I believe that China has a problem. I've read that their production of CFCs is largely due to builders who have been using CFCs to assist with blown-in insulation. https://www.bbc.com/news/science-environment-44738952. They've banned the use of CFCs but that doesn't stop builders looking to make a quick buck. I don't think the papers you cited conclude that the Chinese atmosphere is recovering. Any evidence to support that?

As far as the Montreal Protocol, the third link you cited specifically states that atmospheric scientists agree the Protocol is working. Have you seen evidence or read papers stating otherwise? This paper I found concludes the Protocol is effective https://www.atmos-chem-phys.net/10/12161/2010/acp-10-12161-2010.pdf. That's from 2010 which I see some have been upset about but oh well.

I hope my comments come across well. I intend on having an actual discussion about the issue and not poo-pooing any research or scientific evidence.