they're actually respecting the original in every way possible. They're singing emotionless on purpose bc the chorus is literally 'become sentimental and say goodbye', and I suppose you're trying to convince yourself to kys in this song which is why you try to not show any emotion...
The mv's are just getting better as time goes by. The dance, the 3d models expressions, the camera angles, the technology... Amazing, really. And I like the fact it complements with the characters development in Proseka as well.
i love the direction of the 3dmv and at 1:38 with the letters appearing, just like the original mv (and also the resemblance (but also uncorrelated) to aishite aishite aishite). their little hopping at 0:40 is also very satisfying