>There's literally no reason whatsoever to hide the metadata unless he is the one.
privacy?
If privacy were such a big concern, then why did he release the messages (without metadata) in the first place? Wouldn't it be more appropriate to keep the messages completely private?
Time? He´s busy starting a company, taking the time to drag out decade old emails and digging out the meta data for a journalist who is borderline stalking (assuming he even has them somewhere). I wouldn´t give that the time of day either.