I'm only passing on what Kanger publicly announced on 8/29/2013. We can assume they would know the difference, and had good reason to warn consumers.
No, I don't think we can assume that. There was a major discussion of this during the summer, here and elsewhere on the net. It boils down to certain retailers, Kanger among them, being annoyed that a reseller is selling their product below its MSRP - manufacturer's suggested retail price. The manufacturers, for a number of reasons which only concern their own image, exclusivity, etc. do not want this to happen and cry "fake" so as to sabotage the re-seller's sales/reputation.
Re-sellers such as Fast Tech can and do buy their products wholesale from the manufacturer through "straw man" companies, and then resell them at the price they feel is appropriate.
Fast Tech is trustworthy when it comes to telling us if something is genuine or a clone. If the description says "genuine" or "authentic" or uses the manufacturer's name - such as Innokin - then the product is genuine. You can also get one of the mods in the FT forum to confirm it for you.
Many, many of us here have bought genuine products from FT - I have a number of them - and can attest to their authenticity.