Yeah and ultimately in a very real politik way whatever the Supreme Court says is Constitutional is Constitutional because they are vested with the final say on what the Constitution means at any particular moment.

The CDC has pretty vast powers in a public health emergency and IMO the ability to forcibly quarantine people is a power far beyond the ability to pause evictions and is maybe even a necessary part of the former. (Can't really quarantine someone if their landlord can just throw them out right?)