No car maker is going to state publicly anything more than what you’ve already been told.
It’s a lawsuit happy country anyway and none of them are going to provide any potential ammunition for a legal war. Intentionally vague is normal.
Odds are that this modification will not affect maximum RPMS, horsepower, or affect engine performance in any way and will simply remind the car owner to have the oil changed sooner than what was previously stated by the OLM.
The odds are that the new and improved update may still not be good enough for the real world and the oil may need to be changed more often than the new update will suggest.
What should be done is to forget that OLM even exists and base it on the odometer and time.