I'll dis-confirm this fee for BANELCO, at least today.
At 15:27 today, I extract 190 pesos from my US bank account (PNC Bank) at the Comfi bank on Cerrito 1535. It is a BANELCO bank. As always with this card, there were no fees of any kind, either in the US or here.
Checking my on-line banking site right now (15:55), I show a US$49.94 pending ATM withdrawal from today. So the exchange rate was AR$190/US$49.94 ~= AR$3.805/US$.
Right now, Pagina 12 web site is listing AR$3.79 for buying and AR$3.82 for selling, so I'm getting right at mid-market rate.