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My first thought was cabin air filter too. That looks nothing like the engine air filter for my '19 6.7. Must have changed them for the 2020 model year...
They did, the 2017-2019 have the huge and fairly expensive FA-1927 filter with the battery in front of the filter, the 2020+ more closely resembles the 2011-2016 set up and runs the FA-2031 panel filter in front of the battery again.
Docs is rebranded PTC products from mostly china, they are strictly a middle man with rebadged products. Nothing wrong with them but also nothing special.