Let's do a "for and against" for this lift -
Fake Plates? -
For - Fake plates are known.
Against - You'd have to fake both iron and bumper plates. Rumors that they were 10s were proven false.
Edge - Real plates, real lift.
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Doesn't look like he lifts that much -
For - He doesn't have a traditional #315 benchers physique, which is true.
Against - There are pages of contest verified lifters of similar weight putting up #315 plus. There are known cases of physically un-impressive people doing physically impressive things. Also it was a bad form, grinding rep for him.
Edge - Against. #315 is not unknown for unimpressive physiques of similar weight.
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He has bad form -
For - He does have bad form.
Against - Nothing.
Edge - For. Pete has horrible form.
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Fake audience -
For - Audience plants are a known.
Against - Would've had to fake at least one lift in front of 50-100 mostly disinterested parties. Would be a huge embarrassing scandal if found out.
Edge - At best, inconclusive. A draw.
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When you look at it like this, the odds are with it being a real lift.