They also don't seem to account for the reduction of sulfur emissions from ships, which is surprising given how widely this was reported even in mainstream media.
Is this an oversight (or "oversight") or something that is reasonable for some reason that would be so obvious to experts in the field that it's not worth mentioning?
I mean...they're just cherry-picking the sources of "noise" that prevent their preferred window from showing "significance". It's not like they did a thorough analysis of every uncontrolled factor and carefully tried to control them all. Even that would be crap, but at least it would be good-faith crap.