Sorry - my edit went past the time-out - ignore previous comment. I've marked the main edit.
You answer my questions first please
What do you understand is meant by "no player"?
Can you tell me which players on the park "no player" doesn't apply to?
Let's go back to the Law first:
[LAWS]15.7 FORBIDDEN PRACTICES
(c) No player may fall on or over the players lying on the ground after a tackle with the ball
between or near to them.
Sanction: Penalty kick[/LAWS]
The ball-carrier sets off on a run. I tackle him and go to ground in so doing. We therefore at this point have "two players lying on the ground after a tackle with the ball between or near to them"; me - and I'm now a/the tackler, by definition - and the (former) ball-carrier, who is now the tackled player.
The Law applies to all players on the park; but not all of them are capable of infringing against it by "fall[ing] on or over the players lying on the ground...". The tackler - I - cannot, since I cannot fall on or over myself, and unless the pitch is particularly steep it is physically impossible for me whilst remaining on the ground to fall on or over the tackled player.
It may be that when I went to ground in executing the tackle, I did so "on the wrong side"; but in so doing I could not have infringed against Law 15.7(d) because I haven't in so doing fallen "on or over the players lying on the ground after a tackle". Until I completed the tackle by taking the ball carrier to ground whilst in my grasp, and going to ground myself in so doing, there was no tackle for any such action to be "after".
I agree that the law refers to the act of making a tackle, not the phase of play. I understand you to be saying that if in making the tackle I land on the ball-carrier that is an infringement. But the problem you have is that I did not fall "after" the tackle"; I fell "during" the tackle - I am a tackler, not a tackle assist, and fell (went to ground) in making the tackle. I did not fall on the ball-carrier "after" the tackle. It would be different were I a tackle assist - but I'm not.
You also are arguing that virtually every tackle ever executed consitutes an infringement of the Law. If you were correct, I could only legally execute a tackle either by ensuring that I was underneath the tackled player as we fell, so he fell "on or over" me - and then of course he would be the one infringing the Law - or that we fall to the ground separately - and how often do you see that happen?
The more general problem is that we are talking about tacklers who claim to be trapped on the wrong side of the ruck. That player may incidentally have landed on the tackled player, but the meat of the problem is that he ends up beyond him (from the point of view of his own goal-line). That is not an infringement of this Law, even if any incidental contact with the tackled player were.
On the other hand, any team-mates of the ball-carrier who do "fall on or over" me, thereby trapping me on the "wrong side" of the ruck,
have infringed against that Law. I am one of "the players lying on the ground after a tackle with the ball between or near" to us.