Ah. I overlooked that. You guys are correct. Thanks. This spurred me to look up this ECAM.
FUEL L (R) TK PUMP 1 + 2 LO PR (CENTER TANK NOT EMPTY)
It concludes by directing you to the gravity feed checklist, and the status page showing
CTR TK FEED: MAN ONLY
I suppose the centre tank fuel wouldn't technically be trapped. You'd just have to send it the long way around.