That point about Elo is irrelevant. Games on Fishtest use bullet-like time controls (60+0.6). Significantly shorter than 1 min per move. As originally suggeste

That point about Elo is irrelevant. Games on Fishtest use bullet-like time controls (60+0.6). Significantly shorter than 1 min per move. As originally suggested, when running modern Stockfish at 60 seconds per move the games overwhelmingly tend to draw. Even when the older engines make slightly worse moves.