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Saw one guy on utube comparing the oil passage diameter of the lifter hyd unit to a power stroke. It was about half the diameter. He seemed to be thinking it's a feed issue and that's also the reason they may have moved to the 5w 40. This would seem to support your theory though.
I looked at a few of the threads and became overwhelmed with scanner information.
Any newer suggestions out there for a 2022 2500 Cummins for reading and clearing?
I thought that note was applicable to only the displayed warning "5mph Max Speed on Restart, Long Idle, or Refuel. Service DEF See Dealer".
I'll study it in more detail.
Thanks for pointing that out.