As I understand it, Kel-Tec is trying their best to stem the flow of US-market guns coming into Canada to prevent more grey market firearms from adding to the existing problem. I think NS actually bought guns from a US distributor that went belly up, and there are no laws preventing them from doing so. Unfortunately, retail stores are just as complicit when they sell these grey market guns without informing the buyer as such.
A lot of stores just copy and paste product descriptions directly from US sites, including the parts about the Lifetime Warranty, when in fact the guns don't come with one. It gets worse when a store stocks Kel-Tecs that came from Vault (with a lifetime warranty) AND also grey market Kel-Tecs from NS that have a questionable 1-yr warranty. That's not good business.
The whole spare parts market in Canada is a thankless job for any retailer that tries to take it on. Look at how many companies have juggled being the CZ importer over the years.
I've worked in firearms retail in Canada so I know a bit about the ins and outs. I can only imagine it puts Vault in a tough spot because they want to remain a wholesaler only, but now there's a number of Kel-Tec owners out there looking for spare parts and they can't provide any parts because no retailer wants to stock them. Vault did say (before CGN deleted them) that they could easily bring in parts to supply the demand, but they'd need a retailer to actually place the orders first. They also said they're looking at creating their own retail side for parts, but who knows how long that would take?