I have no evidence to support this but I reckon that's what clubs do in 99% of these longer term injury scenarios nowadays.Isn't meniscus normally 6-8 weeks. Surely won't be 12 hence north being cautious and saying 'up to' 12?
I'd imagine they've told him they expect he'll be back in 9 "but the press release will say 12 to take the pressure off both you and our medical staff".