I didn’t see any explicit rule in that direction, and sometimes posting edits from commercial software adds value to the discussion, like the noise reduction thread you’ve mentioned.
But it doesn’t make sense to me posting DxO edits all the time, when there is no particular reason.
But I’m relatively new here at the forum, and maybe I’m being too radical.
Honestly, the impression I get is that you’re trying to prove how better DxO is from other free software. But, again, I’m probably wrong, and if I am, I apologize in advance.