“Even Gaon admitted that frum poskim haven’t come out in support of the eruv after Reb Moshe’s psak. ”
All I said was that there are “many” wouldn’t state their official support, even if they do indeed hold so. The reason is simply because they do not need all that extra pressure of being attacked by people that do not know the subject, (as some commentators have indicated) “how can you argue against the posek hador”!
That is how I would do had I been a posek. I personally know some who have written extensively on the subject, and will not print it due to having to deal with some controversy attackers…