To explain further, the Chasam Sofer argued on the Pri Chodosh, and held that as a davar sheb’minyan, the gezeiras Chazal applies even when there is no chashash of iruv davar tamei.
The Chazon Ish is siding with the Pri Chodosh. R’ Moshe is siding with the Chasam Sofer, but saying that government regulations are a kiyum of the takanas Chazal.