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Not my problem that you think it's for no reason lol. Just because you "think" that Oda showing the reaper has to mean it's him getting up, does actually mean shit lmao.
If the purpose of him seeing a hallucination or Ghost is due to the drug or Wano's current state with the fire festival, then that's LITERALLY a plot device, nothing else is needed. Nothing is required to fit your headcanon of Zoro "benefitting from the scene". He didn't "benefit" from taking Luffy's damage from Kuma either. He was weak the following arc. You just don't like any other interpretation of the scene, now this chapter.