Oda isn't changing his story. The editors confirmed it and all his editors know the story
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Oda is a troll and he talked about not knowing how to defeat kaido when kaido was introduced around chapter 800, the supernovas were introduced around chapter 500, so what you're saying doesn't make sense because the supernova came before kaido
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No he said that around 2015 as a joke and Wano started in 2018
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Oda didn't have the concept of the warlords either but they still fit in the story
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Oda is a troll and he talked about not knowing how to defeat kaido when kaido was introduced around chapter 800, the supernovas were introduced around chapter 500, so what you're saying doesn't make sense because the supernova came before kaido
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No he said that around 2015 as a joke and Wano started in 2018
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Oda didn't have the concept of the warlords either but they still fit in the story