There was not much impact of prelude bcz they just gives us precap that what was done before IW and given us little bit information of all things like shuri is washed out hydra programming from Bucky’s mind.etc

Aside from what Mystery has said this also helps people that missed on IW to understand a little more on what is going on.

Prelude is all flashback without even a hint of further story

It will not effect anything it shows only flashback