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This note appears:

<"Black could have tried to keep up the attack by playing h5. The text move simplifies matters and easily leads to a draw. 22.Nxf3 Re4 23.Rc4 Qe6 24.Nxd4 Nxd4.">

This sounds to me as if the three moves given by Capablanca at the end of the note could actually be part of the game rather than just a possibility. "AMerican Chess Bulletin> *April 1921, p. 75) presents them as actually played moves.

Regardless, the moves 22 to 24 should be added to the score. The submitter most likely got the score and notes from Capablanca's book on the 1921 and 1927 matches (Dover edition p.19-20). That note is present, but moves 22 to 24 are part of the actual score.

In addition to ACB (and of course, the Capablanca book), other sources also give the complete game through 24 i.e. BCM and the Khalifman/Yudasin book on Capablanca (Vol 1) to name just two.

"I had never seen this variation [10...d4] before and I therefore thought for a long time in order to make up my mind as to whether I should play Bxf6 or Ne4."

Capablanca did have this (Black to play)

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As White in Capablanca vs Olland, 1919 which Lasker may have known about and 10...d4 was Lasker prep. (there is also another simul game with Capa as White but I'd doubt Lasker saw that.)

However if it all depends if Lasker saw the correct score in the Olland game. See Capablanca vs Olland, 1919 (kibitz #2)

Lasker had played fairly well, so far. He could have drawn game 5 at move 45.

When the match started Lasker had done <no> preparation. As the match carried on, perhaps the great Lasker may have had an optimistic feeling about the match.