I'm finishing up a DCEU rewatch before The Flash and pretty much did this and assumed WW84 was a continuation of Diana reminiscing given the narration.This is a minor thing, but I think Diana Prince's voiceovers in both WW films are supposed to be her talking to Bruce Wayne. Because of this note he gives her, I imagine shortly after the 2015 bookends she's having a conversation with him about her past and explains the events of both WW films to him in November/December of 2015. WW84 could be December since it turns into a Christmas story by the end. Thoughts?
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As for the new date, I feel it works better. Having just rewatched Man of Steel, the weather in Smallville and Metropolis fits more with where The Flash places it rather than the November date on Lois's camera.