I knew I'd get a sensible answer here!
I don't know about spoof - that's actually why I ask, though.
The pic is one of a series from a reputable source, and the Blue Angels' airmanship does seem superb, at least to this layman.
I remember seeing a pic of a Su-27, I think, sort of hanging at an angle like that, but nowhere near as close to the ground. Not the same thing, perhaps.