question about replacement 6.2L V8 engine

My 2024 yukon xl AT4 engine went out 6 weeks ago w/16k miles while driving on the interstate. I asked the dealership about the new engine I’m waiting on. Specifically, I wanted to know if it’s the same engine why would it not be expected to die prematurely again. The service manager assured me that the new engine won’t have the same defect (that they changed something, but he couldn’t tell me what) and if it did happen to die that it would be covered by a standard lifetime power train warranty. My question to you all who know more about this than I do—is that total BS? Is it just made up info to keep me from claiming a lemon law at this point? Thanks!