A pardon won’t erase a conviction. He’ll lose his law license.
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Are you sure? Although, it won’t erase your conviction, it is supposed to restore all your rights.
https://www.wklaw.com/governors-pardon-destroy-your-criminal-record/
While receiving a pardon will restore some of your rights, it will not seal or destroy your criminal record. This means that you will still have to inform new employers of your criminal conviction and disclose this information in any other situation that requires you to do so.
“Are you sure? Although, it won’t erase your conviction, it is supposed to restore all your rights.”
Having a law license is not a right.