How the App Intent Vocabulary Property List works?

Question

I have implemented all five intents for workout: start, pause, resume, cancel, end.

They basically works with phrase:

Start my workout using MyApp

But here I need to replace phrase workout with service... so I have added App Intent Vocabulary Property List to the project like this:

I assume that thanks to this, I can call Siri like this:

Start my service using MyApp

...and it works like a charm. But works for every five intents. Shouldn't it work only for Start Workout?

Intent Phrases are for Siri guide, and it also works:

Let me understand it well, this .plist is only to replace default workout keyword and to setup guide for Siri, right?