Yes, the complete Halion Sonic factory content is included with Halion 7.
If you activate and install Halion 7, it will be installed as a separate plug-in. However, all of its content will also become available in Halion Sonic 7 (except for the “HAL Factory” library originating from Halion 4, for technical reasons).
The “Halion Sonic 7 Collection” also includes all of the Halion 7 factory content, except the aforementioned “HAL Factory” library. This collection isn’t the same as the exclusive content that’s included with Cubase and other Steinberg DAWs.
Before attempting to upgrade, please check this topic:
Free HALion Sonic 7 (included with Cubase, Dorico...) cannot be upgraded to HALion 7!
In short, if you’ve never paid for Halion or Halion Sonic before, then you don’t qualify for upgrade pricing, unfortunately.