He obviously hasn't posted much since 2013, so that gap kind of makes sense and a password change isn't a huge red flag for me unless it's accompanied by an e-mail change. Sometimes people change their passwords for security reasons. Plus his post quality seems to be consistent from 2013 till now.
It's tough getting PP deals done on the forum because they're so risky. OP, you don't have any positive trust, so that's probably what's going to prevent you from buying bitcoin. It's an unfortunate fact of life here, and don't take it personally.
Thanks for the support. I needed some BTC to buy something as I do not want to open my cold storage. I ended up getting someone on IRC #bitcoin-otc to help me out.