OK, to begin, I thought you were originally talking about pinning the man on the far right side of the ball, not just the right side of the net, which was why I brought up the hitch. In either case, this is bad practice.
Collignon sets up the pin off centre with the man towards him. Why? Because he is already to the right of the net and he sees the opening on the far push side. He knows that in order to get there with full extension (around the defender) and square off the shot he needs to set up the ball off centre. Otherwise the ball will not get there in time.
This is not the case. Collignon can hit deadman push from ANYWHERE. If he couldn't, no defender would respect his push side unless he was to the right of the net. Either the hole is open or it isn't. Yes, Collignon does spend quite a bit of time with the ball set to the right of center, but he is perfectly capable of hitting a square fast push from dead center, just as he is if the ball is set to the left of the net. Also, when he is on this aforementioned spot, he's capable of hitting a really nice middle (and he does have to move the ball to hit it), a really nice deadman pull, and a pull cutback to the middle. His walking in this video is sporadic, and he often comes right back to this spot instantly, where he shot probably over 3/4 of his shots from. Watch enough Collignon videos, though, and you'll see that he literally can do anything that he wants.
If you constantly practice push side from solely the right of the net, then you'll only be able to hit push side from there. This is fine, as long as you aren't walking the ball all the time, and you set your pin there and rock. If you're walking the ball, and you're not to the right of the net, are you going to choose to shoot the push side? If you do, will you hit it? As a defender, I have the upper hand if you're walking the ball and you're either located dead center, or to the left of the net, since now you're in a situation where your push side is weak. This is again a tell.
Walking the ball is only truly effective if you can hit every hole from any position, as well as hitch options going for splits. This is why you have to practice pushes, pulls, and big dot middles from everywhere in front of the net, and make them effectively fast, square, with no tells.
And back to the necessity of being more to the right for scoring deep push side: Watch video of one of the greatest German pin shooters of all time, Frank Brauns. He definitely sets up right in the middle the majority of the time, and rarely even walks the ball. He absolutely nails deep push side.
So to reiterate, I'm not saying to avoid practicing a pushside from this spot, I'm saying avoid making this the only spot you shoot push from (edit: unless you want to make this your primary set. If so, walk the ball sparingly). There's a big difference.