Loki Disney Plus - Trailer

But a variant on our timeline would still look like Loki
why would branching a variant timeline turn him into a Hulk Loki or any of the other very different Lokis?
I
but this Loki did not create a variant except for this one the show focuses on
he didn't in the past (or Mobius would have mentioned it) and in the future he's dead
i 'suppose' he could be creating all sorts of variants starting now
but all the different Lokis they showed him seemed to be from different timelines, no?
So, here's a question that might be a bit bigger.

We already know about the dark dimension. The Ancient One already talks about multiple dimensions. I forgot how she stated it in Endgame when talking about the timeline branch being an alternate reality. We know there is a sacred timeline and the TVA does their best to prune it and keep it singular.

So, the question.

Do multiple dimensions all operate on the same timeline? I.e. is the timeline, and split realities,.different than a 'normal dimension.

Does a split in the timeline create new dimensions or alternate versions of that dimension.

Like, are they splitting that hair?