I'm trying to find some data ... not just a video of a "talking head" (ok, maybe she's the lead investigator). She did "blab" on about cold temperatures affecting the ozone level, and didn't say anything like the obvious "we normalised the results for temperature". Of course that'd involve some normalising coefficients (which may be speculative). But if you synchronize ozone level and temperature then you'd see "oh, this was a warm year, that's why the small hole" (or the other way round ... warm = large hole).
What I have found is from "Wattsup" ...
...
which says that more study revealed a hitherto unknown reaction creates molecular Cl from seawater.
We see that so often ... more research reveals deeper mechanisms and deeper understanding (and more questions).
Now could a source of molecular CL inside the polar region be responsible for the free CL at altitude ? (rather than CFCs liberated, to a large extent, on the other side of the equator). Maybe they can show (by isotopes?) that yes this Cl came from a CFC ?
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.