If it is a regular group meeting, then there should be a mix of regular faces, some of his students, one or two bigwigs, maybe some visitors, some colleagues. Maybe a regular time but NOT for the hours he says.
Is it his specific group, does the group have his name on it and he'd Head or PI? Or is he just part of it? Is he responsible for funding?
Again, I'd be massively surprised if there wasn't a hybrid option and he HAD to be there FTF every week. Especially if its not his group.
Could he be blurring boundaries and there is "some" meeting but he claims he needs to be out FTF for longer as no-one cares about attendance.
Also, the timing seems really excessive - everywhere I know is struggling with attendance with hour long hybrid meetings every week.
People won't even Zoom in with their video turned off for an hour weekly to make up the numbers! The timing he mentions sounds more like a "yearly conference big meet", not a weekly one.
Is there some actual hands on laboratory-based work everyone needs to be inspecting or discussing? Or is he so senior he needs to have some high "senior board" meetings regularly?