Like other things, Zilzul seems to us like an undefined entity and based on emotion. But from Reb Moshe’s Teshuva it looks like he had a clear Hagdarah. In this case I think it is clear to anyone.
What you get is a ‘somehow kosher’ way to do whatever was Assur yesterday. There is no difference to the outside observer between one and the other. It is clear even from advocate right here that they don’t really grasp what’s behind it. It’s just a Melacha become Muttar.