It should be noted that DaMoshe’s translation is not 100% faithful to the original, and the differences would make a nafka mina both l’chumra and l’kula.
And popa’s point would definitely impact the last part of the teshuvah.
I don’t know any specific poskim who argue, but R’ Moshe is admittedly going against the simple reading of the Beis Shmuel (DaMoshe didn’t quote that part).
There is definitely a case in which R’ Moshe assers (DaMoshe quoted it, albeit inaccurately) so how can anyone judge that another individual should stay??!!