This is the second time I've heard that he moved early off his line during the penalty. Your framing of this is curious in that it's as if you're trying to in any way suggest that the two situations were related, which they were not. The penalty was given later in the half and controversially to begin with, as it appeared to be a good slide tackle in which he got to the ball first, while others you don't consider the touch to be important have also seen Silva diving prior to the contact.
In any case, the giving of the penalty following the review was quite fortunate for City, and despite your claims of him coming off his line early, if he did, it would have been too marginal to be grounds to correct. Here are two angles of the penalty. He appears to still have his left boot on the line at the moment of contact. It seems to me that Henderson timed his move perfectly and had one foot still on the line at the moment of contact.
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Well they were decisions that went against both Palace and City. City were denied an "obvious" free kick by VAR's inadequacies while Palace had to endure a penalty given against them for what seemed to be a good slide tackle.
As Fans Against VAR stated :
VAR got both key decisions wrong, one against City and one against Palace. But to say that place didn't beat City fairly and squarely, well, Palace weren't the ones who made those errors. You can't blame a club for poor decisions by the referee. It was Palace's job to play and they played a great match. It was the referee's job to officiate and as usual they failed to officiate the match without controversy.