That could be glass over framing not a window in the center.
I've managed high rises constructed like that.
Fire looks real to me and possibly that an accelerant was used
or that the man was already dead before fire. Would take excessively high
heat in the unit to blow the windows.
Presumably the unit had smoke detectors [known not to have sprinklers]
FDNY would have gotten to the unit timely [5 mins or so] if detectors alarmed
That appears to be a lot of fire damage