The NZTA LAMS guy I've always dealt with is named Graham. It's possible you got a generic NZTA guy whose just giving you the party line.
It's up to you, obviously, but I'm still going off of what's written in the rules and on the site which says that 251-660cc bikes must not be modified.
Considering how many zillions of 250s there are with aftermarket pipes on them, I personally don't worry about it. If you piss of the coppa enough they can always find excuses to ticket you. Otherwise, you'd have a hard time finding one that knew enough or cared enough to ticket you for a can on a 250.
A mate got pulled over on a non LAMS approved 400 with an aftermarket zorst on it while on his R, and cop didn't even bat an eye at at.

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