This is overall a good argument that Greek parties aren't necessarily unsafe, but I question this reasoning. Would universities have jurisdiction to intervene in off-campus houses?
If not, even if they can't stop all potentially dangerous parties, wouldn't it still be progress to improve safety at alcohol-heavy events where universities can? In the 2020s in the United States, three deaths were related to fraternities due to overconsumption of alcohol, with many other cases in the 2000s to 2010s (source: https://en.wikipedia.org/wiki/List_of_hazing_deaths_in_the_U...). It is plausible that off-campus parties could be more dangerous, but it looks like it's still an ongoing issue at Greek parties too.
Current scrutiny by universities and the media have directly led to Greek societies to want to introduce safety measures to reduce this from happening, and the scrutiny is justified by past deaths.