Re: Eh?
This is basically a way of using their gcloud command line tool in a more Powershell-native way. Not sure why even a Windows power user would use it over gcloud though...
If they do drop it after a year or two, you can easily go back to gcloud, which is what it's probably using under the hood anyway (I'm guessing).
Either way, it's nothing to do with Apps Script, which runs in the Googlesphere and is used for glueing a bunch of Google Apps together.