I completely agree with you, but I have come across people in the past doing Taekwondo movements but with Japanese terminology for the basic movements (very weird to hear/discuss). I had hoped we had one such guy here so I could find out how that came about or his instructor's background.
But as I said, I'm with you...
You think that was weird, I sometimes crosstrain with other clubs, usted to be with a kyokushin karate club ( really improved my TKD), since I stopped with TKD I do now crosstraining for my HKD or JJJ.
this year I went to a "Happo Jutsu" club (= style that was created from HKD and JJJ). There they used korean terminology for the kicks and throws, japanese for the punches and groundfight. That really doesn't sound.
PS: My instructor was a 4th dan with ITF and a 3rd dan with WTF.