I may be being naive here so forgive me if so, but surely the owner knew full well this was an illegal breed when she got him, and that the risk associated with having an illegal dog is that it will be taken & destroyed.
The reports all say the dog was reported for behaving aggressively, again this lies at the owners door IMO. I'm not really sure what else the Council are supposed to have done?
Regardless of opinion of whether the law on dangerous breeds is right or wrong, at this stage it is the law and the owner has broken the law, surely?
I see a guy near me walking what looks suspiciously like an American Pit Bull sometimes, it's always muzzled and harnessed so at least he is being vaguely compliant and responsible, but he is still breaking the law by owning the dog. People own so-called dangerous dogs for their own image not because they love the breed unfortunately and their dogs have to pay the penalty
but it is the owners at fault, not the law enforcers?