to defeat evil is always good, BUT

someone explain Me that rook move recommendation, I see that variants all in My favor, but the purpose of rook move seems unclear somehow, what's the real point of that pin?

As near as I can tell, 23 Ra4 would have set up the possibility of putting your queen on a2, behind the rook.

I suppose you're talking about the move recommendation 23.Ra4 (instead of 23.Qxb5).

The rook takes advantage of the pawn being pinned to use the a4 square.
From this position, there are two threads:

1. from a4, the rook can go to b5 on the next move, creating the famous "Alekhine gun" (triple battery). The black queen has to flee and behind her, there are the poor undefended b7 pawn and the king. Probably the end of the game. The reason why the black bishop would have to come back on f8 to protect the b4 square.
2. the second thread is that a new battery can now be formed on the a-file, with the queen coming on a2 or a3, to attack the king on a8.

@Goran_Pastek said in #3:

... from a4, the rook can go to b5 on the next move, creating the famous "Alekhine gun" (triple battery). The black queen has to flee and behind her, there are the poor undefended b7 pawn and the king. Probably the end of the game. The reason why the black bishop would have to come back on f8 to protect the b4 square. ...

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I guess it might also be mentioned that, after 23 Ra4 Bf8 24 Ne5, 25 Nf7 would have been threatened.
And, after 23 Ra4 Bf8 24 Ne5 Rg8 25 Qa2, 25...Bd6 meant that Zenotheevil would have been able to react to 26 Ra5 by going for 26...Bxe5 27 Rbxb5 Qc6.