I didn't backtrack, OR say it was a form of time travel. It's a manifestation of that concept. There's a critical difference. If I used the term 'form' I was incorrect. You describe it as a burst of speed but that's not how it works. Goku described it as that in an attempt to explain its use to everyone else, but the Kais and Whis & Beerus refer to it as temporal ability.