To the car manufacturer, 'lifetime' means the lifetime of the product, when production ends, so does the 'lifetime'. So u better believe in warranty period (that's still available), rather than lifetime promise.

BMW once claimed the ATF in their gb is SEALED FOR LIFE.

Hyundai also followed with the "SEALED FOR LIFE" "zero maintenance", only to clarify later, the 'lifetime' meant 150k km.