Oxymoron or typo?
“Finite, yet unbounded” was used in a graphic novel (comic book) called “So Beautiful, and So Dangerous”, but is a quote of Einstein.
Take the surface of the earth. We know it's finite in area, but you can travel in a straight line anywhere on its surface and never fall off an edge, say, or bump into some kind of giant wall that lets you go no further. It's finite, but unbounded. The universe may be the same, except in three dimensions (or more) instead of two.
It’s topology. Mathematical concepts often seem strange at first.