AGR Valve Exchange – Lifetime guarantee from Volvo?

I bought a Volvo XC60, built in 2015, D3 – 150 hp. I bought it with 93000km. Now it has about 116000km down. I bought it in the car dealership, was completely cared for by Volvo checkbook. On the basis of this I saw, however, that the previous owner has driven only short distances since Corona, because between the services were 7000 – 9000km. I drove the car about 17000km and then the engine control light lit, but disappeared again. The engine output went into the cellar over time and the average consumption was 6,7L. Fortunately, I had a warranty when buying it. Drive to the Volvo workshop and the error was the AGR valve. Cost point 1723,70€ for the exchange of the AGR valve and cooler. 60% of the material I had to pay anyway, the rest the guarantee. Now the vehicle runs perfectly again, passing through fits again and the consumption went down to 5,6L on average. In the workshop mei If I understood correctly that the AGR cooler + valve has a lifetime warranty from now on, since it has now been improved and has larger inlet slots than the previous one of 2015. Also, this should now be a unit. My question would be, you know something about it, can this be true with the lifetime warranty? Thank you in advance. PS: I myself drive medium long distance. Tanke Aral/BP Premium Diesel and use the Ravenol EFS oil, which has a low A In addition, change the oil every 10-12k km.