The authenticity of the ten. indications does not raise any doubts here. Chopin added them in the proofreading of FE or – which is more likely – still in the handwritten base text to this edition. The second possibility is backed by the presence of such indications in analogous bar 43 and similar bars 60-61, also in other sources – in bar 43 in GC, while in bars 60-61 in EE. Chopin could have added them subsequently in various manuscripts, however, he did not pay attention to synchronising the additions.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE
notation: Verbal indications