Itchie Meir levin was not a “rav.” He was an askan. A good askan, but also not above criticism, and had made errors regarding his presentation of Agudah’s daas Torah on the world stage.
Reb Yaakov never said such a thing. It’s laughable that a gadol would change because of a simple observation, not that that was ever the discussion to begin with.
What he DID say, speaking as a talmid of his yeshiva, is the exact opposite – when the satmar rov’s sefer on the 6 day war was published, they met (which occured often, as they lived near each other at the time).
The satmar rov had written that even if his sefer changes the mind of one yid, it’ll be worth it. Reb Yaakov told him, “I’m the one yid.”
Blogs are full of nonsense. If you want to know what gedolei yisroel held/said, talk to their talmidim!