truthsharer: I’ve never heard that R’ Cohen said the eruv is ok. AFAIK, he actually said it’a assur to use it.
cherrybim: according to R’ Moshe, there’s not. R’ Moshe didn’t hold it as a chumrah, he held it’s chillul Shabbos d’oraysah. If it’s a real shas hadchak, like pikuach nefesh, you don’t need an eruv anyway, so what’s the issue?