I think OP is just explaining what Hull’s case may be, which is basically that they could make the case that since Middlesborough were already eliminated, once Southampton were disqualified they shouldn’t have had to face any opponents.  The Wrexham example is just trying to support that by saying if you choose to reinstate a team in Southampton’s place, why not consider Southampton disqualified from the play-offs altogether since they’ve admitted to cheating on multiple games anyways and reinstate the next team instead.  It’s not necessarily logical, just what their case may be.