It was a proper workshop manual and its contents were comparable to the workshop manual I had bought in 1974 for my T140 and certainly as comprehensive as I required.
But admittedly I didn't have to rebuild my 2016 engine

AFAIK the online subscriber manual is the same as provided for Triumph dealerships' "factory trained technicians"

From memory it didn't cover repairs to every individual component, especially electronic circuitry, but did have how to test them. As a competent home mechanic it was all I needed.

It did require you to have the correct diagnostic equipment.