In my experience what's actually going on is a mix between "no, we don't do that here" and you're technically allowed but unless it breaks production you're not even given time to put a day or two into submitting a bugfix. Much more likely to merge the fix locally or something stupid. No idea about this poster, of course. Phrasing it as "my employer doesn't let me" would be less specific, but maybe also not wrong in this case.