The poco ritenuto indication was most probably added in the proofreading of FE. A probable reason could have been the layout of the note text, in which bar 97, the first in the new line, was devoid of a clear suggestion of retardation (smorz. is at the end of the previous line). In the graphical layout adopted in mUltimate Chopin, the validity of smorzando until the end of the E major section is beyond any doubt, hence we include poco ritenuto, of a detailing character, yet not introducing any new elements, in brackets.
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category imprint: Differences between sources
issues: Authentic corrections of FE
notation: Verbal indications