yes, that's right, it should be in the suggestions and feedback forum. and people on dp get's banned for 3-6 months generally, so don't worry! when the infraction will get over, you will see him again! cheers!
They aren't going to tell you why he was banned. Someone asked this very question in Suggestions and Feedback a few days ago and Shannon (Smyrl) replied "we can't divulge that information - it is the business of that user" or words to that effect.