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The study is here.

Our analysis shows that reductions in OH during the COVID-19 period (2020–2021), followed by a recovery through 2023, accounted for ~80% of the interannual variations in the CH4 growth rate. These reductions were linked to declines in NOx and CO emissions from human activities during the COVID-19 lockdowns, which temporarily weakened the oxidizing capacity of the atmosphere. When OH rebounded, the methane sink strengthened, slowing the growth rate.

That's pretty damning evidence that switching to plant-based alternatives for milk products isn't just helpful towards beating climate change, but rather a necessity.