Note the article says "appears to be at the centre". It's a comment on the observation that the universe is expanding, not a literal statement. If you naively assume the universe is expanding from a single "origin point", then Hubble's observation of expansion happening everywhere would imply every point is the centre. This obviously doesn't make sense, and that's because the initial assumption that the universe is expanding from a single central point is incorrect.
DiZ1992 t1_iu1cemr wrote
Reply to ELI5: How is every point the the universe the centre of the universe? by Head-Plankton-7799
Note the article says "appears to be at the centre". It's a comment on the observation that the universe is expanding, not a literal statement. If you naively assume the universe is expanding from a single "origin point", then Hubble's observation of expansion happening everywhere would imply every point is the centre. This obviously doesn't make sense, and that's because the initial assumption that the universe is expanding from a single central point is incorrect.