You are correct. All of the services are not tied to any framework and you will be able to use them regardless of what you use.
ScreenBuilder is a fairly new product and at the moment supports only scaffolding of Kendo UI hybrid apps and NativeScript native apps.
Test Studio Mobile is also a newly introduced product and at the moment it provides only APIs for getting and operating on the DOM elements of the app. You can't get the Angular JS models directly with it.
All of the other services don't depend in any way on the framework. They provide their own JS libraries or Cordova plugins that you have to include and use in your app to make use of them.
Let me know if you have further questions.
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