I think your misunderstanding the term ONLY here. Those products only get a warranty if they are purchased from an authorized reseller or Corsair but that doesn't mean that they grant you a warranty if the product isn't listed there.
Storage isn't a huge part of their sales, and while it's odd that it was not included there is no inherent distinction between products that are and aren't listed there. The lack of inclusion doesn't create or imply a distinction.