Well, aside from Darren being right about this being the easier stuff that was mainly Jochen and some of Biskup hammering away at and only finalizing just recently(that crazy amount of platforms took some doing indeed on Jochen's part), the proper team counts to 4 people, Tile support bumping that number up to 5 as I'd imagine there to be quite a lot of overhauling getting done to NotEye on an actual near'ish timescale as opposed to just whenever.
Money for Time(ly) Doings is at the core of this, versus Just Art or Just an Original Soundtrack----each of which historically costly on otherwise unless you happen to be rather multi-talented and well equipped. If one makes it about personal financial straits, I believe Biskup has done pretty well for himself accruing much responsibility for others as it goes....but I don't recall any indication that the other 3-4 folks are in a comparable situation.
Skeletor is certainly correct on this being an important moment in Roguelike history as sadly all too often it has been the case that the fore-bearers and Old Guard as it were have sadly vanished with the winds while their projects, which still hold substantial value and are often still not eclipsed to this day in one respect or another, atrophy and get forgotten. This finally happening is like some of the original Rogue fellows getting back into it, the IVAN guy trying again, the DevTeam putting out a release very much like Biskup's here for Nethack, the Valhalla/Raganrok fellows riding out again, and all other such matters.
End of the day, a classic is now in a better form for posterity than would've been otherwise, stands a chance of that becoming even moreso the case, and a legitimate fresh release to entice newcomers with as opposed to getting somebody to openly invest time in a game stuck in time with quite a bit of polish needed in terms of modern standards after a decade or so.