youdont:
Saying that an area with over 600K people is a reshus harabim is definitively not a chiddish. The shittah of the Aruch HaShulchan doesn’t seem to have ever been accepted by anyone; he’s just choosing his wording wisely when talking about a previous posek hador.
We went through this same issue with Richmond: you can’t claim that Reb Moshe “would have” been matir a Brooklyn eruv. He was explicitly asser it. We don’t need to guess how he would have held based on other teshuvos.