Hi!
I'm also an international student from Argentina. My situation is a bit different from yours.
First, my university has decided to teach online/remote in the Fall, at least for the vast majority of courses. (It is almost confirmed that the political science department won't teach any F2F classes).
If I cannot get my Visa and arrive in the US by August, my university has offered me to study remotely during Fall 2020 (like the rest of my cohort that will be in the US). However, in that case my graduate assistant appointment will be rescinded due to inability to provide documentation of employability. BUT, they will waive the Fall semester tuition (except for a very low fee per credit). If I cannot be in the US by August, my university will process a Visa for the Spring 2021 semester.
As for your question on the subsidized student housing, I would recommend against paying for housing that you won't be using. If subsidized housing is not available when you arrive in the US, I'd suggest looking for off-campus housing. But I really don't know how cheaper is the university housing compared to the alternatives.