Did you manage to make it work?
I'm using 3.2.3RC4 with Visual Studio 2019 Community. The plugin installed without any error, but I get neither the announced code completion for node paths nor the "Launch, Attach and Play in Editor" entries in the debug drop-down menu.
I've tried with my existing project, and with a new project, to no avail.
Is there anything to change in Godot/Visual Studio settings?