It's been that way since they added DR, that's not something new in the patch nor would it affect kill trading in any way. Inform yourself better before posting.
There's is a LOT of misinformation going around right now so unless you hear it from an official post I wouldn't listen to anyone. It's not that your guildies are lying to you, people are just getting speculation mixed up with facts.
He's talking about general phasing not the class/group phases. There's several instances on each server so even when you're out in the open world you're still 'phased'.