The date range of engines
produced in the time of the known lifter issue is of biggest concern (Sep 2020-March 2021). This likely hits all the early 2021 MY production, into late 2021.
That said, there are some 2022 owners who have reported problems as well. As a previous poster said, this design/scheme has been in production back to 2007; but the newer DFM engines have 2x the lifters. That said, yours truly ran a 2013 Suburban w/ AFM for 115k trouble free miles. Now rocking a 2022 Yukon XL produced in Jan 2022 (engine produced in week 47 of 2021). At 9k miles now with no issues.
My gut is it is a less than 1% problem…there are a LOT of these on the road…1% would still be a large number. But; if it were more than that; you’d see way more fails.
There is a whole thread or thirty three on Lifters…search and read to your heat’s content…but remember; most soccer moms rockin the Denali are not coming here to post. They are gassing up and going.