I believe there's been a misunderstanding: This rule equalizes all speed feats no matter what, what you are referring to is things like KE or inmesurable time travel feats; however, feats for moving themselves are equalized, even if not the rest of it's parameters.
In other words, if a 9-C character can move at supersonic speed and has 7-B KE thanks to it, and is equalized to average human speed, then he still has 7-B KE, just with average human speed.
Also, and this is mostly for clarification since I believe you already know this, what is equalized is Combat speed, with the rest of the speeds being affected by the multiplier resulting from the equalization.