Depends on context, but possibly yes. Although that hinges on the word time travel.
Like, fundamentally you could say that you have one timeline that spans multiversal space. In the beginning, that space is empty. Then you rewrite the past so that 3 universes already existed in the space (which is the same as creating 3 timelines). So you rewrite the timeline of the multiversal space.
Then you do the same again to add 5 more.
Technically, you could say you only spawned several more multiverse spanning timelines. Like, now a empty multiverse spanning timeline, a multiverse spanning timeline with 3 universes and a multiverse spanning timeline with 8 universes exist. The total number of timelines is only 11.
If you are able to travel between multiverse spanning timelines, you would also be able to switch back from the multiverse spanning timeline with 8 universes to the one without any universes/timelines.
However, if you do that specifically via time travel, then that could be a good indicator that you are actually dealing with an additional time dimension. Because that indicates that the progression of the creation of timelines is done within a (presumably continuous) flow of time and that time wouldn't be that of the regular past where those universes always existed