Spoofing it means passing it despite lying during the exam. But this is a case where it did detect lying, so the question becomes, what is the subject matter about which Strzok was untruthful during the exam?
They’re not admissible because they’re utterly unreliable and mean nothing. Pretty much the only thing they’re actually good for is playing the “bad cop” part in good cop/ bad cop and getting people to confess. The whole science they’re based on is utter bunk. The damning part of this whole story is that the FBI still uses this junk science on its own agents.