It's a fully framed floor assembly, it's more of a loft than a real attic. You can see the vented section at the top above the plywood I still need to paint lol

Great point - I don't remember the exact load calcs, but we've had movers and all sorts of awkward heavy heirlooms up there in the past with no real issue, it really is just holiday junk at this point. I respect the abundance of caution though.

And to clarify no it's not an active living space; my dad set it up as a covid quarantine (which fortunately was never necessary) and decided to stick it in the corner and save space for more the aforementioned junk.