Supports what? That paper seems to be narrowly about the economic impact of loan forgiveness, not about nationalizing higher education or about other potential solutions to the causes of student debt.
Pardon, this was deeper linked, but your previous comments describe the overall forgiveness as a bandaid, or generally not helpful. That is not supported by the research.
I do think it is a bandaid and generally not helpful, even if it is not economically damaging. Economic benefit or damage is only one aspect of the question.
Why? Because a lot of people don't support counter-productive band-aids and would rather advocate for policies that solve actual problems? That doesn't seem like our issue to me...