HIE: “I beleive Rav belsky really really really went deep into this inyan to make sure it’s mutar before being matir it.”
I don’t doubt it, but the bottom line is that Rav Dovid Feinstein, Rav Heineman and Rav Forscheimer did NOT think that was good enough to be meikil on a deoraisa against Rav Elyashiv etc.