So after a lot of discussions with @Voldara (ty for your time ), turn out that when you push up the AML( or AMR) they play as Second strikers ( also called inside foward or deep lying fowards, he become a false 9 if there isn't a main striker in front)

So what is a second striker ?
Is a player that play a mixed role between a AMC and a ST that only play in the middle

his duties are :

- support the striker by giving him assists or run directly(from a deep position) through the defence and score
- support the midfield to retain possesion
- Come back to defend when the team doesn't have the ball

You can see his position in this pics

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So mystery solved