For a hypertimeline you
have this image. One axis going one direction and one (or more) going in a different perpendicular direction. Like with geometric dimensions, by having two of them intersect, you need a third governing axis, which is the hyper part of the hyper-timeline. Like how to store an Aleph-1 amount of 2D planes in a single object you need an infinite 3D cube.
Like I said, controlling the hyper-timeline is not needed unless he's controlling all temporal axis for the Multiverse at once. He would just be controlling that singular temporal axis for the in-between space. If you want a more goofy comparison, using the previous image the most he'd do is control sideways time rather than forwards time in that instance.
It has an element of time, but it doesn't have a separate temporal dimension. His time still goes front-back (or sideways I guess), which is on the same axis as normal time, just with different rates.