I don't know what sufficient playing strength is, but I'll comment anyway.  Black's control of the d-file likely compensates for his damaged pawn structure.  There is still a little bit of play in the position and there are opportunities for both sides to make mistakes (well, aren't there always?).  For example, 22 Qxh6 releases the blockade of Black's center and allows ...f5, when Black may be able to combine central pawn advances with action on the g- and h-files.  Even then, White's position is probably solid enough to hold, and if Black overpresses and White can exchange queens in a favorable situation, Black's structural deficiencies could tell.  Prolly about =.

All that being said, I am suspicious as to whether this truly represents best play by both sides.  Surely White can find some way to restrain the center other than exchanging knight for Black's dismal DSB.  I haven't examined these positions in detail because I prefer 5...Nf6.  In fact, these days, I prefer reaching the Dragon via 2...g6, bypassing the Moscow entirely.  Clearly not an option for the ...d6/...e6 crowd, though.