The initial post complained about Erwitt's hypocrisy because he posed, i.e. manipulated, a photograph pre-acquisition, and at the same time, Erwitt is vocally critical of post-acquisition digital manipulation.
Because we have no prior knowledge whatsoever of how the photograph in question was taken, there are only two possibilities: Erwitt staged the photograph and is, in some sense, a hypocrite. Or, Erwitt was at the right place at the right time and recorded a natural scene with no artificial intervention on his part.
If Erwitt silently waited (maybe for hours) for an imbalance of viewers to occur - this is not manipulation. It is simply editing what the photographer (in this case artist) wants to portray by choosing when to press the shutter. This is no different than taking a photograph everytime a group of people congregated in front of these two paintings and selecting the one the photographer feels is most interesting.
There is only a 50:50 chance Erwitt is a hypocrite. Whatever one concludes, that conclusion has nothing to do with the facts and everything to do with the concluder's prior experiences.
So, without more information, only the observers' prior knowledge (experience) can determine whether or not Erwitt is a hypocrite. And that decision is completely subjective because none of us know the facts.