how am I suppose to remotely delete my google account on a device that is accessing a specific app
Go to Google.com or any Google site.
Sign into the account you're referring to, if you're not already signed in.
Click the circle avatar or photo (a blue person by default) in the very top right corner of the page.
Click "Account".
Under "Recent Activity", click "Devices".
Click the device you're referring to.
There should be a big red "Remove" button next to the words "Account access" under this device once you have clicked the device.  Click this button.