It's minutia they dug up that almost no one knows or cares about and they're using it to put their own spin on it for the sake of whatever argument they're making.

Ask them to explain how they expect syndrome to have displaced phenomenon when "imposter phenomenon" is practically non-existent in common usage and knowledge. If we can judge by the trend alone it would seem the reverse may become true.

https://trends.google.com/explore?q=imposter%2520syndrome%2C...