Wouldn't the evidence of inflation occurring in other countries suggest that COVID is its primary driver, rather than a specific monetary policy? (though it does seem that the scale of inflation in the U.S. is a little higher than elsewhere)

See for example:

UK: https://www.reuters.com/world/uk/boe-chief-economist-says-uk...

Australia: https://www.reuters.com/business/australia-core-inflation-sp...

China: https://www.reuters.com/world/china/chinas-factory-gate-infl...

Germany: https://www.reuters.com/world/europe/german-inflation-could-...

Brazil: https://www.reuters.com/article/brazil-economy-inflation/upd...