But those fullbacks or wingbacks were before playstyles. Even here was a whole youtube video about player positions and how it changes depending on player positioning in his zone by charlie diary if i not mistaken.
So we can say that those playstyles existed before playstyle introduce, but now we have flashing icons which effect is unsure. Players can do the same without playstyles anyway.
Just because aml/amr in up position is inside forward not false 9. Even those playstyles say that.