Where did you get this information? 
If action speaks louder than words:
1977 Richter
April 9, Debrecen, Bartók Hall.
[1] Beethoven: Andante favori in F,
[2] Schumann: Carnival in Vienna, op.26,
[3] Chopin: Scherzo in B minor, op.20,
[4] Scherzo in B flat minor, op.31,
[5] Scherzo in C sharp minor op.39,
[6] Chopin: Barcarole, op.60 (encore)
[7] Chopin: Three Etudes op.10/6, 10, 4 (E flat minor, A flat, C sharp minor encores)
I have the recording.
I have to admit never having read that Richter said that he thought that opus. 10 No. 4 was a good encore.
A beautifull encore can be Godowsky's Alt Wien.