hello 99,
First of all, I do not intend any comments to be derogatory toward Rabbi Belsky, Shlit”a, chas v’sholom. I only mean to show why I find his approach less compelling. He is a tremendous talmid chochom, and I hope I have not said anything which can be construed as a personal attack.
The Pachad Yitzchok does not take the approach you ascribe to him. He suggests that we be machmir, and assume, l’chumra, the possibility that chaza”l erred. His approach was rejected by his rebbe, who said we believe chaza”l with certainty against the scientists even l’kulo. Please don’t take my word for this, look it up.
I have seen an approach that you describe, that chaza”l described perception as reality. This does not seem appropriate for this case, since the migration to the flesh from the viscera is evident even without scientific theory or microscopes. I am m’katzer here, if you wish,I can elaborate later.
Again, if I came across as negative towards R’ Belsky personally, I forcefully retract any such statements or connotations, and ask mechiloh. I mean only to debate the sugya, and how one shoul “fir zich” l’halochoh.