Both the length of the majority of the accents and their placement, not over the note, but slightly after it (cf. a typical short accent, e.g. in bar 284), indicate the use of long accents by Chopin. However, in EE and GE3, it is difficult to consider the marks to be long in spite of the fact that their asymmetrical placement was preserved.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Long accents, Inaccuracies in GE
notation: Articulation, Accents, Hairpins