That article brought up some more Great Filters that I hadn't thought of before.

A counter (which I'm not sure what to think about): we would still see the old technology of advancing civilizations spread everywhere before some Great Filters like the secret empire civilization that got big first and wipes everything else out. Although, if that old technology is old enough, we probably wouldn't.

Then there's the Simulation. We don't see anything because there is nothing, because this is a simulation. The only thing I've come up with that counters the simulation hypothesis is that (I think) it assumes math exists outside this reality. I can't say that's a good assumption or not.