For clarification, Power Test owns like 8 or 9 other Dyno companies and don’t just do industrial ones. Theres a link in their page showing all the different ones; my friends CBR600RR lived at the factory for a while because they were working on motorcycle chassis setups and he had something like 100 “dyno miles” on it last winter, lol!! He also has an old XS650 Yamaha that he pulled out of a junk pile they used as a test mule. They also do a lot with race car motors.I have no experience with industrial dynos like the ones produced by the company your friend works for. I'm sure they take more into consideration and provide delineated numbers.
I think Superflow is their chassis inertia division.