He did a sufficient pm:
Your Skype:
My Skype:
Chat Logs:
That's the whole point of a PM, It's role of the buyer to ensure the data matches. Same happens when you're trading over 500m, you triple check the RSN matches the skype logs and you have sufficient enough screenshots to prove that. I've come across similar RSN's before and is probably a bigger problem than this one.
Either way I do partially agree that there is no harm with including more specific details like RSN, BTC address and anything on them lines, but calling him out is unfair.
What I do with 9/10 trades is document the process from start to finish, this includes all in game interactions and forum interactions. Simply screenshotting via ShareX is the easiest way to have a folder of this proof.