The indication recommending a clear highlighting of the bass "singing" is characteristic for Chopin – a similar marking is to be found in, e.g., the Variations in B
major, Op. 2, bar 25, the Rondo in F major, Op. 5, bar 151, the Rondo a la krakowiak, Op. 14, bar 502. Moreover, Chopin would often use a juxtaposition of indications which may seem to be contradictory, combined with the conjunction 'ma' (but), e.g., veloce ma accuratamente in the Variations in B major, Op. 2, bar 135 or semplice ma grazioso in the Piano Concerto in F minor, Op. 21, 3rd mov., bar 1.
Compare the passage in the sources»
category imprint: Differences between sources
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notation: Verbal indications