Their policy says: "Defective products will be replaced, exchanged or repaired at our discretion. "
That wording is important because manufacturing defects usually appear relatively early, while most later issues are related to long-term use, normal wear, lack of maintenance or ammunition quality. I suspect defects resulted from long-term usage are not covered. Perhaps, as a peace of mind they offer spare parts kits despite lifetime warranty. And I rather prefer to have one or two in my spare parts bin.
Not sure whether the manufacturer itself provides the lifetime warranty and passes it onto reseller, or rather the reseller takes on the risk. I guess, from a business perspective, lifetime warranty is a very effective marketing ploy to increases buyer confidence and boost sales, especially in the Turkish firearms market. The bet is on most of these firearms will likely see low round counts anyways. That's why rental firearms are specifically excluded. And the spare parts are cheap, as long as they are available.
Although, if they do cover long-term wear or aging-related failures - the financial risk could become significant over time as more and more guns enter circulation, more and more models become discontinued and spare parts become unavailable. Let alone the manufacturer may no longer be in business or brake contract. So, they may eventually be forced to replace or refund entire worn-out firearms, and when that trend will start growing - that's where it ends.
Anyways, I appreciate TI for their business of bringing in interesting and affordable things. Especially, I like a parts kit option along with the new firearm - more than their warranty. Sometimes, it is cheaper and efficient to replace a $20 part which you already have on hands, rather than pay for shipping and wait forever for warranty repair. And TI knows it too.
PS: it's been 3+ months and they still struggle to bring in parts kits for the current model being produced and imported. Not TI fault, but it does give a good idea of how long warranty repairs might take.