I dont think this method is very precise.
Date codes should be used in conjunction to get an accurate reading.
CECH 2511a ACEPTABLE Slim
(a or b denotes the model version ie: 120gb or 160gb/ 250gb or 320gb/ 160gb or 320gb)
By this list it could
be, if we assume region has nothing to do with bricks
But then above it says :
You are region 2, the tested one is region 1... who knows....
I wouldnt instal this CFW until its been made stable by Rogero.