Since my previous post I came to the "conclusión" that probably didn't/wouldn't have made much difference.
The migraciones official apparently determined that the 1.5 year stay, combinef with the additional exits and entries was enough evidence to demonstrate to their satisfaction that you have been "living" in Argentina as a tourist, without the proper residency required by law.
If they acted "on their own authority" as far as I know which is prescribed by law (the decreto of 2010?), I don't think anything you could have said today would have made any difference, even citing you never otherwise stayed more than 180 days of a rolling year. It was up to them to make the call.
There is aslo a possiblity that the same official will give a "pass" to others tomorrow, but if the decreto of 2025 is now being strongly enforced by the officials at the border, of course that is far less likely, and the consequences far more serious.
Frankly, I've never undestood why anyone would ever ovestay a tourist visa in the first place and I can't think of a better way to give migraciones the middle finger, regardless of how complacient they have been in the past regarding the enforcment of the laws. That's their prerogative, not ours.