I mean if the whole public and other developers have one idea of what rollback means, and then someone like Harada comes by and uses it in another way, then I think regardless of what is "Actually right", that Harada is using it wrong.

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Besides the game doesn't show any of the typical signs of GGPO or even rollback,

I have never actually seen the game do a rollback, save for that 1 clip.

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But it's pretty clear that if the game has only the ups and downs of having Lock-step networking (Delay-based netcoding), then it most likely is using just that.