yeah, because Watzke hasn't lied before
They'll sell. Ultimately they don't really have a choice at this point - after selling both Hummels and Gündogan (who were in the same situation in terms of contract length), they'll never get Mkhitaryan and Raiola to sit out their final contract year. Raiola has already started burning bridges.
They have obviously rejected United's first bid (€24m according to Bild). They are now in full save face mode, trying to up the price and finding a suitable alternative (according to rumours they want Yarmolenko). If United (or Arsenal/Chelsea/whoever) end up offering around €35m, Watzke will sell and simply say that the circumstances have changed. This is not Watzke's first dance.