I'm happy to help, but unfortunately I won't have time to deal with this in any detail for about 10 days.  I agree that Stevecyberbunny'''s edits are inappropriate, but I don't agree that they're vandalism: edits are only considered vandalism if an editor is attempting to harm the article.  In this instance, I think the editor believes he his correcting inaccuracies.  In my opinion, he is adding material not supported by reliable sources.  While this is inappropriate, it's technically different from vandalism.  For example, if no reliable, published source explicitly says Matt the Knife is, as he put it in an earlier edit, "facing scrutiny," or that his records have been challenged, then the article shouldn't say those things either.

First I have to ask you if you have any connection to the subject in the article, because that will limit the ways in which can mitigate the problem.  If you are affiliated with Matt the Knife in any way, it is generally considered inappropriate for you to be editing the article  with some important exceptions I'll come to in a moment.  Please have a look at Wikipedia: Conflict of interest to see if it applies to you.

If it does apply to you, then you are entitled to revert vandalism  but please make sure you've thoroughly read the definition of vandalism.  You are also entitled to remove anything defamatory or any negative unsourced or poorly-sourced information (please see Wikipedia:Biographies of living persons.  If the editor persists in restoring material you consider inappropriate, please raise the matter at the Biographies of living persons/Noticeboard.  If you post to this notice board, make sure to declare your conflict of interest.

If Wikipedia: Conflict of interest does not apply to you, you are free to rewrite the article as you please, provided any material you add or change is anchored by inline citations from reliable sources.  Please see Wikipedia: Verifiability for more information.  If you end up in a conflict with another editor over the article, try to find common ground by starting a discussion on the article's talk page.  If you are unable to resolve your conflict this way, please see Wikipedia:Dispute resolution''.

Feel free to keep me informed, but I won't be able to respond until after March 23.  ekrubrR