It and all the other MTH Nohabs were cancelled; that MTH page you referenced is in error. As I recall, the project was cancelled pretty early in its life, so I don't think any tooling was started; it may not have even proceeded to the design stage.
A "better" [ yes, that depends on the points of view ] model was available from Heljan in 0 scale, but 2R only of course, so that probably doomed the Euro market for an MTH one. An even better model is now available from NMJ, again 2R only ex-works.
Given that full carbody, it should be possible to find a basket-case Heljan and convert it to 3R if you could find 3R truck blocks with a suitable wheelbase -- if one really NEEDS a 3R version, or even if you didn't, just for 'fun'.........
Best regards, SZ