I didn't dispute that. I just pointed out that HS2 benefits London to Birmingham, everywhere north of there gets slower trains and, to my absolute amazement, the Planner tells us that intermediate stops at useful junctions like Nuneaton cannot be accommodated in the timetable.
I think you are conflating matters.
HS2 is not giving slower journeys to everywhere north of Birmingham, quite the opposite for the vast majority of journeys on the WCML.
But HS2 wont be open for the best part of a decade, and this timetable change is nothing to do with HS2. Nuneaton has more calls in services on the WCML than it has ever had, IIRC. So im not sure what your point is?