That was the point. You're also correct, it's probably not "safe" just "safer". The "er" does a lot of the work.
Like all the mitigations, they're not an on and off switch. It's a continuum.
Given that exact room, with those exact people, exactly as pictured. Having most of them in masks is safer than having none of them in masks. It's neither completely safe no completely unsafe either way.
Lots of it depends who those people are, where they're from, what the transmission rate is in the those areas, and how many of them are vaccinated. Lots of things we don't know. If everyone in that room is really from an area of low transmission and they're all vaccinated, the only exposure being the trip to the room, the mask difference may not matter at all. If they're all from areas of high transmission, none of them vaccinated, and they've been hanging out in poorly ventilated bars all week in those areas, then the mask is probably very important.
Neither of those is likely true. Somewhere in the middle. Though, based on the current county picture, they're probably mostly from areas of high transmission.