There have been studies that a lot of airbnbs make neighborhoods less affordable. On an anecdotical level, I hear friends and conocidos talk about converting their formerly long term deptos into airbnbs, and investing in deptos en pozo to later rent as airbnbs.
Seems like a realistic K populist move that probably wouldn't solve anything. They'll point to an European city that did something similar to show they aren't radical and it's a common sense measure.
This measure may even benefit a few politicians. Outside of the major chains like Hilton, Marriott, etc many hotels are used for money laundering by corrupt officials, narcos, and so on. If they make it more difficult for rent short term rentals, more of this money flows into hotels.
Of course, Argentines are pros about getting around regulations, but it would make things worse for short term visitors and the mom and pop investor.