This was maybe the most pathetic coup attempt in recent years (excluding jan 6th and brazil's jan 8th because they both wouldn't have worked as actual coups regardless). At least some part of the military was clearly in on it too, but they didn't even stop the representatives from voting to invalidate the declaration, and even worse, it was attempted while the opposition nearly had a supermajority, and with an incredibly disliked president.
Maybe this is overthinking it, but why would you ever try a coup without at least some popular support? Yeah, it doesn't matter what the people think as far as making it happen, but lack of popular support often leads to a lot of instability, and the first one to die in an unstable dictatorship is often the guy at the top.
Seems a bit early to tell if this will have much of a lasting effect. So-called economic "shock therapies" have a long history of working for a year or so, and then unraveling later. And especially for Argentina, the cycle of decades of growth followed by decades of recession has been going on for a while now. I'll be genuinely impressed if he manages to actually fix the economy long-term, but that still remains to be seen.