I think my earlier answer addressed what you're discussing.
In addition to what I said in that post, I see it more as him prioritizing who needs to be in a mask. His point was that healthy people wearing them wrong, or handling masks wrong, could more likely get themselves infected, by having a stronger sense of security than they would. One protection doesn't eliminate the needs to be cautious in other areas. i.e. hand washing still needs to be a major thing.
I think the "suspected to have covid" is the trickier part, since people can spread it without showing symptoms. So, everyone is possibly suspected. That's why you see a bigger push for masks in shared spaces. Less for personal protection, more for community protection.
And again, I believe more data on the aerolizing of the virus has come out pushing this further.