2012 and 2013 are required for Exchange 2016 and 2019 to run, this is pointless and if you remove them, you blow up your onprem.
Originally posted by @OldePSN00b in #1336
This is an important point. The phrasing of this finding and associated documentation make it sound like those versions are no longer needed and can be uninstalled rather than the fact they need to be upgraded to the most recent version in their respective series.