On a first pass through the paper that you linked, I see a couple of instances where they use parameters that directly match conditions on earth. I don't know

On a first pass through the paper that you linked, I see a couple of instances where they use parameters that directly match conditions on earth. I don't know how well some aspects about Venus are known (e.g. the exact rates at which trace gases are emitted by volcanic activity on Venus). My personal take on this is that the big claim doesn't seem entirely watertight. And claims like that have been taken apart quite quickly in the past.