Is it possible to revoke AWS Cognito IdToken?

As @AllanFly120 wrote in mentioned topic:

Because IdToken is represented as a JSON Web Key Token, it's signed with a secret or private/public key pairs, which means even if you revoke the IdToken, there is no way to revoke the distributed public key. And IdToken has a short life span, it will expire in a short time.

It resolved my doubts.

You are correct. The globalSignOut call revokes all tokens except the id token. The id token is a bearer token that is generally used with services outside of user pools. I am on the Cognito team, and we do have an integration roadmap on our calendar to have services that consume id tokens check back to see if those id tokens are valid and not accept invalid ones.