I’m no expert on Europe but I follow it pretty closely,closely enough to know that this ploy has a very good chance of succeeding in the courts there.
Not closely enough. Even (even!!!) the execrable ECHR agreed that he should be extradited.
Abu Hamza's application for an injunction to delay the case came after the European Court of Human Rights (ECHR) backed successive UK courts in ruling that the radical cleric could be handed over to the US.
The 'lawyer' is grasping at the last straw, and that straw is short.