Yes you can go ahead and remove these statements on his userpage.  If this user continues to make such edits he can be banned, however I would like to try and resolve any disputes with users and explain to them the rules of wikipedia, rather than run the risk of permanentley blocking someone prematurely.  And BTW, his current block hasn't expired just yet, he still has about 10-12 hours left on his block.  Thanks for asking me about this, I'll be sure to keep an eye on his contributions.    (tlk) (cntrbtns)