No. He may be confused because while it is billed monthly, it can be an annual subscription. It sounds likely he is on the annual-but-billed-monthly plan.
We have discussed this before several times but as I understand it, cancellation can often only be done without penalty in the first month of a new annual term (or the last month of an existing term):
https://prodesigntools.com/guide-to-change-cancel-creative-cloud.html
https://community.adobe.com/t5/account-payment-plan-discussions/cancel-subscription-faqs/m-p/11885718
The early cancellation penalty for an annual plan billed monthly appears to be 50% of the remaining commitment for the current term.
Either way as ADWsPhotos is saying, the quickest way to find out is to talk to Adobe customer support, though presumably you can log in to his account with him and find out the details of the plan he is on and when his current term ends.
Edited by Unfocussed Mike