It's possible I guess, but at no point has it had a Rep of Ireland plate on it, just some different NI variants. But something like that would possibly explain the V5 note.
It was PDI'd in Preston 2005, manufactured 2005, and given "PE05" plates to begin with. About four months later it changed to NI plates.
It's a weird one. I've Googled it a lot but can't find anything quite like it, and there's a lot of disagreement of whether NI would count as an import or not.
I'll post what the DVLA reckon once they get back to me. Right now I'm unsure whether it counts as an import for insurance purposes, because it's a UK model PDI'd and sold in the UK originally...!
(On a side note - I looked at a JDM 350Z too before buying this one. That one DIDN'T show up as an import on HPI, despite having the short JDM chassis number, being a Fairlady Z, with the square reg recess etc all on it. But to my mind, had I bought it I'd have insured it as an import, because it clearly was an import)