If a provider changes her name, the review does not stop being linked to her profile.
Each member has a profile URL.
My profile is below.
http://www.eccie.net/member.php?u=250288
My Extention is 250288. That number doesn't change if I change my profile name. The name attached to that profile can be any set of characters.
Reviews are assigned to a profile URL, not to a name.
Member's posts are assigned to member's URLs.
I hope that clears things up.