It looks like QDS-10145 was only partially fixed in QDS 4.3.

If an absolute user import path is used, then this is now correctly parsed inside the editor.

However, when you click on run/preview, the call to "qml2puppet" is wrong, and you get module not installed errors.
It still treats any import path as relative, and appends the user import path to the current directory, regardless of whether the user path starts with "/" or "C:/", etc.

Note: QDS 4.1 LTS exhibits the correct behaviour.