That could be true too...
The lady told me (1) our aisle - aisle 22 - was part of the YF zone for the FU games, and she also said (2) that this was because the away fans zone took part of the YF zone.
That's what she said... but it could also just be that they extended the YF zone into our aisle.
Either way, check your tickets, and make sure you are where you think you are going to be.