No, not taking a siegemaster army to the GT (if I get to go). But looking at the codex instead of working saw the language on fortifications was different to the rulebook.

Fortified position
Swordwind
Up to 500mm of trenches and 500mm of razor wire, plus up to 6 gun emplacements or bunkers.
100 points

EpicUK Codex
Up to 50cm of trenches and razor wire, plus up to six gun emplacements or bunkers.
100 points

All the changes are documented between swordwind and the codex, but this isn't. So is it a change that hasn't been recorded, or it is intended to mean the same as swordwind?

It's intended to mean the same as Swordwind. I'll change the text the next time the Guard codex is updated.