Something quite impressively calm looking - if maybe well known - from LC0 after a quick look.
After 4 Nf3 Nf6 5 g3 Nc6 6 xx it tends to revert to h5,h4 stuff but After 6 d4 it just goes o-o, h6, Qd7, Bg4 develops its rooks and seems to generate plausible play vs the weak e4 spot.
If you let it play its inevitable(?) first idea of 5.. h5 then after 6 d4 h4 7 gh it basically does the same, except obviously with queen side castling instead!
(Nc6, Bf5, Qd7, o-o-o etc.).
White's judged around a soft 60% there, maybe a little less and it seemed quite easy to get into a bit of a tangle.
Its not so scared of 5 Nc3, so I suppose it thinks its getting on for playable. Mind you given that it thinks 1 f4 d5 gives black a tiny advantage, and all of Nf6, e6, c5, g6, Nc6, c6, a6, Nh6, d6, f5, h6, b6, h5, and b5 are better first moves for black this isn't really approval

Actually 1 f4 h5 is amusingly 'logical' - 2 e4 d5!? and otherwise it reverts to d5/Nf6 in classical style, with the reversed Leningrad heavily deterred!