Yeah, Morgan, the push is there, but if you look at the next few frames, rather than taking defensive or evasive action (which most players would do if they felt the push), Cameron continues to lunge forward, looks at his opponent and puts the arm and elbow up. If not deliberate, reckless in the extreme.
Foxtel showed footage of his previous reports and at least four of them were serious hits, with the same degree of recklessness. He's a serial offender and a harsh penalty is probably the only deterrent to further offences, because he's got off pretty lightly in the past. He might think again if GWS misses out on the finals because of his suspension.