My guess is supported by the experience that, in AI research, every time someone came up with a plausible test for intelligence, an AI system eventually passed the test only to make it clear that the test was not really testing intelligence after all (edit: I don't just mean formal tests; e.g. see how chess used to "require intelligence" right up until Deep Blue vs Kasparov).
Some people see that as "moving the goalposts" and it's certainly frustrating but the point is that we don't know what intelligence is, exactly, so it's very hard to test for its existence or not, or to measure it.
My preference would be for everyone in AI research to either stop what they're doing and try to understand what the hell intelligence is in the first place, to create a theory of intelligence so that AI can be a scientific subject again, or to at least admit they're not interested in creating artificial intelligence. I, for example, am not, but all my background is in subjects that are traditionally labelled "AI" so I have to suck it up, I guess.