IF they are determined to win a case, (for whatever reason) they will send it to the lab where and experienced machinist with a full machine shop and access to parts will eventually get it working.I don’t think there is any case law to definitely say what is deactivated, and what is not. Absent a definition, the burden of proof would on the crown to show your former firearm is not reasonably deactivated. There is a presumption of innocence to overcome in such a case.
My bet is the crown would settle out of court as they do not want definitive precedent in this space. Very likely the courts would allow a lower standard than rcmp recommends, if the firearm that prompts the case is truly rendered unusable.
There is no definition (to the best of my knowledge) as to the degree of difficulty required to reactivate a firearm in order to class it as deactivated..