I think we agree it is quite obvious that Sony sent out Dev-Kits back in 2012. But back then it was a rumor, and that is also the basis of the article you linked. Stick to the rules, don't treat it as a fact until you have a proper reference. 
BTW, it is fine if you state in the history section that there were rumors about Dev-Kits being sent out. This is a fact, and I was trying to emphasize this before I removed the statement.