The post about DP getting banned from adsense is made when someone noticed that the ads totally disappeared from DP forum, but now it's back. So, the argument is considered answered.
I don't think any of these rumors seriously affected anything at all with the value or worth of DP, anyone that is in the market at the price range value of a huge site like this isn't dumb enough to be affected by some simple rumors on a message board.
Though I do not get adsense $$ from DP. But DP still a very nice place for me to ask questions and get answers. Still many helpers here.