I went during 2.0 (about 3 days before the grand reopening) and I saw it in storage. A few days later I went and there were no traces of it (as Taco Disco said it was only there for an hour)
I went to northridge during the process of 2.0, id say maybe 2 or 5 days before the grand-reopening, and I was told by a employee it was a “test wall-art” that was sent by corporate itself, so it is infact real.
Correction to Puzhtops comment: this did in fact appear in Northridge as a test poster for around 1 hour. A CEC fan who wanted to get photos of northridge during its remodel took a image of it, bashing CEC for it on social media, resulting in it being removed.