www.fide.com/FIDE/handbook/LawsOfChess.pdf9.6: "The game is drawn when a position is reached from which a checkmate cannot occur by
any possible series of legal moves. This immediately ends the game, provided that the
move producing this position was legal."
syzygy-tables.info/?fen=8/7K/8/1n1kN3/8/8/8/8_b_-_-_0_1KNvKN statistics (unique positions)
White wins:
6 (0.0%)
Draws:
3,134,432 (100.0%)
Black wins:
6 (0.0%)
Those 6+6 positions are still a thing.
For example: 104...Kd6 105 Kh8 Ke6 106 Nf3 Na3 107 Ne5 Nc2 108 Nc4 108.Ng4 Nd4 109.Nh6 109.Nf6 Kf7 110. Nh7 Ne6 111. Nf6 Nf8 112.Nh7 Ng6#