WRONG WRONG and WRONG AGAIN. The CDC does not specify the implications of mask use in regards to the need to quarantine. If the Gedaliah Society or the vaguely identified Dr. Rosen made this statement, they/he are highly suspect on all their guidance.
1) Dr. Rosen has been a community doctor in CH for decades. He's is very well known in their circles. The Gedaliah Society and Dr. Rosen are giving advice to that specific community, and that community alone.
2) I'd put Dr. Rosen's track record with this pandemic up against the CDC's in a heartbeat. The CDC has been a political pawn from the very beginning. It's been very well documented, culminating with a FOX News report the other day confirming that all CDC messaging is run through the White House now.
3) It is very likely that the CDC's guidelines are assuming the use of N95 masks. Most masks that people use are not enough to completely guarantee that transmission will not occur when one sustains contact in close quarters with a contagious individual.