There's been a complaint for several decades that "AI can never succeed" - because when, say, expert systems are developed from AI research, and they become capable of doing useful things, then the nay-sayer say "That's not AI, that's just expert systems".

This is somewhat defensible, because what the non-AI-researcher means by AI - which may be AGI - is something more than expert systems by themselves can deliver. It is possible that "real AI" will be the combination of multiple approaches, but so far all the reductionist approaches (that expert systems, say, are all that it takes to be an AI) have proven to be inadequate compared to what the expectations are.

The GP may have been riffing off of this "that's not AI" issue that goes way back.