If you bothered to read the linked article and Volker's blog post (linked from the article), which you obviously haven't, you would see how this is not the case.
It allows you to access your files as a network drive. It downloads the file you open into a cache when you open it and sends it back when you edit it.
True.
I want a solution where the files are physically on my local drive and are synched when there are changes.
The NextCloud/OwnCloud integration does this. I am not aware of a similar solution for Google Drive.
The latest Slimbook is pretty cool. Plus it has the KDE symbol emblazoned on the lid.