They say so on the Japanese homepage, complain to final, not me. Im not saying that, im just citing.
And if you look at the fr graph, the D8000 Pro is defenetly wrong. Just compare it to an professional studio headphone like the Audeze LCD-X and you see, that it has recessed bass and mids (or pushed treble, depending on how you see it)
This is far from correct and makes everything sound overly bright. Some songs like "Let it die" from ReoNa for example are unlistanable. The vocal is just pure pain, needles in your ear. That is _not_ correct, the song is not supposed to sound like that.
Lets just look at the graph of the D8000 Pro alone, without reference
Just look how big the difference between the treble and the mids/bass are. That is far from correct. Its an extremely bright headphone. Its almost 10db difference from treble to bass.
The D8000 is not warm, the D8000 already is a brighter headphone that is not on reference.
LCD-X --> Reference
D8000 --> Slightly Brighter
D8000 Pro --> Even brighter
The D8000 Pro is an D8000 with less bass so you can listen at higher volumes without distorting bass. They explain that on videos on YouTube in Interviews with the developers, you can't just say that is not what they did.
I leveled the graphs at 8kHz to make it more obvious.
LCD-X vs D8000 Pro
M1ST (Another reference Studio Monitor) vs D8000 Pro
As you see, its just an insanely bright headphone, it is _not_ an reference tuning and it is certainly not correct.