<s>The</s> A gravamen of the SARS-CoV-2 furin cleavage site claim is that it's not aligned like others in the coronaviruses you cite.
Because per se it does not prove the claim of bioengineering.
You are of course more likely correct about the alignment issue, I can't find my source now, and the above is probably much stronger evidence. For the alignment you'd have to be a virologist, probably one specializing in coronaviruses, to be able to really judge this. Of course a whole bunch of biologists have shifted their focus to coronaviruses in the last year and a half.
So still nothing to point out to bioengineering in my opinion.