The preparation he did beforehand. It’s explicitly mentioned he took special care to prepare the ring and void itself for the Tournament. Thus, any alterations to the Void’s nature we can discern from before that moment and the Tournament itself can solely and ONLY be attributed to him.
Sort of. We clearly see that the rules of each person’s existence/home was taken into account for the sake of fairness. Hence why no one but those genetically predisposed via wings can fly, which is selectively applied to only the contestants. Even if the Void wasn’t stated to lack space and time, Hit himself would be utilizing Time Skip and Anniliaza was using Spatial attacks in a Dimension outside of the Main Space-Times within the Macrocosms (meaning Hit’s power would be affecting the Greater Timeline overarching all of the Space Times), or if not that, can operate outside of time. Especially since he would then be bringing his own personal time dimension wherever. Anailiza would be fine, though, admittedly, because there’s no indication that the WoV is “lacking in space.” Because that’s not something you can model visually.