Since you are already posting events to a Google spreadsheet using web requestor, think of this alternate app as a different way to get the device values from SmartThings. This code fetches the data values via the RESTful API, so doesn’t involved any Edge drivers. It also includes the code to post the values to a Google spreadsheet, so it doesn’t require the separate nodeJS app you are already using. It’s all built in to one app just to make things easy.
If you want to try using it, you should be able to run it in parallel to your current setup - it just needs to be modified with the same info for keyfile and Google Doc ID, along with some other things. For example it requires your SmartThings Personal Access Token. You’ll also need to modify it for whatever device ID(s) you are grabbing the values from.