Ok, I think I understand the insanity here. When the integration was creating in Hubitat, an OAuth token was created and shared with the Google portal to create the link. In the Google portal, another OAuth token was created, but was never used. That's the one that Google is flagging.
I deleted the one they ear marked for my Google Home Community integration, and it still just kept chugging fine.
Long story short, it seems you can just ignore their warning. They are removing dormant OAuth tokens that aren't being used.
