For,
“Gaon- the Rav that said about the Eidus says he was involved in us discussion with Rav Moshe and he is of the same caliber as the matirim so I don’t think that would fall into the same category as people on a chat being mevazeh.”
Same caliber or not is not the issue – the one using the eruv has a psak from a legit posek, hence by declaring one ‘Posul le’Edus’ is a Bezoyun in the worst degree possible!!
It is a b’zoyun – toward all other poskim that it is based upon. (especially when there is nothing written by Rav Moshe pertaining LA and is all hearsay.)
!תורה תורה חגרי שק
Its a bizoyun – toward each and every city that relied on the very heterim i.e. מוציא לעז על ראשונים – אל תסיג גבול
Its a bizoyun – toward each and every person using an eruv in Yerushalayim, on top of Malbim Pnei Chavero i.e. the person that is an Eid, and his posek and, all present at the chupah that rely on the eruv.
Imagine one saying: all relying on Rav Moshe’s psakim (Chalav Stam, shavers, etc) are posul l’Edus…anyone using a shabbos timer is pasul. Or sfardim saying anyone eating non-beis Yosef shchitah etc..