Coopwise, yes, runwise, too small for 2 solely going off of commonly accepted size requirements posted.
Many birds don't fit that though and either do fine with less space or need even more space than recommended
That's what I've been doing with the one my broodies are in during the day. At night, it's cooler so I don't worry as much. Plus their coop doors all stay open 24/7 anyways, so it's not completely sealed
I still need to figure out how to put vents in mine. I've thought about just replacing one of the coop side doors with hardwire cloth and a movable cover.
Two of mine have the one that came with it for the interior, but they could always use one in the pen too. I know my birds in my grey prefab use their run roost a lot