Hey there GES Khaki, I can confirm that Wee Bear is correct (as he usually is) in that we won't have any information about enforcment action here in the insider program. The only place that they can be reached is on: enforcement.xbox.com. Sadly I don't think you can make a case for your friend he would have to make the case himself on there.
One thing I want to mention that I just happen to know about the enforcement team is when they investigate an account and give it any kind of suspension they go further back and keep digging on the account. So even while on a Comm ban they could have found previous instances where violations were made and will often add more time or increase the severity of the suspension based on that. Hope that helps a little at least and have a great day!
-Hades