A 'standard' JWT claim is Issued-At ('iat'). If you want lightweight JWT's, you're going to be loading minimal user data serverside anyways (logging, roles, etc.) -- it's trivial to compare the iat timestamp to a 'last change' field in your user object.

Of course, this gets to the point of the article -- if you're loading data serverside, that's not reeeaaallly the intended multi-party-claim-exchange use case of JWT's....