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Why is this winning for Black

This is a draw. The engine counts a space advantage for black, but there is no way to convert that. This is a fortress and engines are weak at recognising fortresses.
A position which cannot be improved is not good. High numbers which don’t change are no ounce better than a constant „0“. Fortresses. The trend counts, it is your friend.
It's not really a "fortress" (especially since both players could make the same claim). It's just a position with no more play left.
[Variant "From Position"]
[FEN "2r5/1bq1k1b1/1p3nnr/pPp1p1p1/P1PpPpPp/B2P1P1P/2QNB2N/3R1RK1 w - - 0 1"]

1. Nb3 Nxg4 2. Nd2 Nf6 3. Nb3 Nxe4 4. Nd2 Nf6
5. Nb3 Qd7 6. Nd2 Qxh3 7. Nb3 Nh5 8. Rf2 Ng3
9. Rff1 Bxf3 10. Rf2 Nxe2+ 11. Qxe2 Bxe2 12. Rff1 Bf3
13. Ng4 Qg2#

To say there is no play left in the position is misleading. In chess, when there is no way to make progress, it is important to shuffle pieces around and look for thrusts with which to test your opponent. Chess is NOT a purely technical sport, and you need to have the aggression and savagery to paint the board red with blood. It is valuable to be able to win a drawn game.

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