Yeah entirely new timelines are created when changes to the timeline are made, or somebody travels to and from a timeline, like trunks, and that one person from universe 12. But the point is that, these timelines make totally new copies of 4d macrocosms, which implies it overarches the timelines under it, containing snapshots of 4d macrocosms, which implies a higher temporal dimension, 3 spatial + 2 temporal. And isn't that kind of blatant?
Although we only know it branches only at specific times or what someone wearing a time ring is killed in the past
What would make it qualify is that the timeline that encompasses the multiverse seems plausible knowing the state of timering
but with how timering functions it can also be attributed to merely a verse cosmos mechanic in regards to acausality from wearing the timering (Them dying in the past would cause a different branch instead of completely changing the future and present completely which is then shown and appear as Green time ring)
In theory this could be attributed as 5D
or just a larger timeline which is just larger 4D.
I'm still thinking about it and i haven't had time what were the prior argument from it but i do Remember Vietthai having more knowledge in Dragon ball regarding the cosmology