Should cookies_revoke delete cookies?

Once accepted, non-functional cookies such as GA are not deleted when the cookies_revoke button is clicked. However, no further tracking is performed and eventually the cookie times out.

Shouldn’t cookies be deleted immediately when a user selects revoke, according to GDPR?

Even if not, this temporarily persistent cookie is creating a bit of false info in my GA, suggesting people are spending lots of time on the last page visited before clicking revoke.

Can’t we add some script to that script blocking section to delete the cookies upon revoke? Or is that space only for js to be executed in the cn_cookies_accepted() function?