Several reasons actually. It's because the daizenshuu uses both infinitely expanding and infinitely expansive on different occasions, leading some to argue that infinite = really big since the statements appear contradictory.
Another major reason is Bulma talking about the edge and center of the universe.
However, the daizenshuu statements differentiates matter and space.
In the scan you provided, it mentions infinite space on one page but on the other it says infinitely expanding when speaking of galaxy illuminations and life.
When speaking of the 4 quadrants, the daizenshuu describes it as infinitely again.
Another daizenshuu statement says the universe is an endless space that wraps around celestial bodies.
Pretty clever how the statements are used if you ask me.
VBW has been against infinite statements for years, how did you not know about it? lol