Even a broken clock is right twice a day. Competence is demonstrated over time, not in a vacuum of individual decisions. Someone that is competent at Chess proves it over an entire game. A novice can still make a few good moves over the course of that same match.
Pretty much any competency can be demonstrated that way.
No need to move the goalposts. The original comment wasn't arguing whether POTUS was competent or not, which is what you are trying to argue.
The original comment was arguing whether any of the POTUS work was competent. And that H1B change seems to have been competent, according to the general consensus on HN.
Is the entirety of the rest of POTUS' work incompetent? Maybe. That wasn't the original claim though.
But did POTUS do any of that? Part of his administration may have some competence, but the wast majority don’t seem to have the greater good in mind nor interested in respecting democracy. To me that is part of competence in government.
Pretty much any competency can be demonstrated that way.