Once more, I will repeat, as I am the one who linked the gameguide in the first place,
"...there is an official game guidebook, that states
Bayonetta "slows time." However these statements are later contradicted by Kamiya himself, as he makes an appearance in the same book, with the above interviews I've posted in the OP. And in my mind,
WoG + in-game statements > Guidebook.
Basically, if we look at all the available information/sources, in-game texts and out of game interviews/statements, there is overwhelming evidence towards Temporal Control: Witch Time and Light Speed, being an actual speed boost.
The only evidence (that I've found), for Witch Time being a time slow, is within 5 lines of the game guide, and the Smash Bro's trailer (which wouldn't matter anyway, since it isn't canon).
All other sources, multiple WoG statements and in-game texts, state Bayonetta can speed herself up. (
In-game feats can be said for either way, since as I said before, time is relative, so it wouldn't make a difference to how the ability looks.)