Massa is striving to regain lost electoral ground through substantial expenditure
Basically trying to hold on to power in any way possible. Primary elections were very unfavorable to the usual parties (the one currently in government and the one that was in power before and are acting more like a branch of the first one lately) and a guy that has some economic sense but also is a bit crazy a la trump for Argentina standards (you can find a lot of speeches and ramblings with him screaming, leans against abortion while spreading a freedom message, is pro gun carrying) is the one on the lead, so the other 2 parties are running a campaign on (a) throwing money at the population (below inflation interest loans, straight up grants, this “removal” of taxes, etc) and (b) scaring people (they go into peoples homes, colleges or train stations explaining how the guys that is on the lead is going to destroy everything, Big % of the TV news cycle is bashing on the guy on the lead).
This move is part of that.
Ah, one more piece of context, Massa is basically an acting president at this point with the low power the real president currently has plus the powers and support Massa has. This makes his “I’m going to make everything all right when I’m president” message a lot weaker than he intends to.