Yes, they have been—I had an open ticket for a refund (Epic Wings, to cover the difference between now and then), and it was just sitting there for some reason. As I spotted this thread, I went to check for the status, and noticed it had been closed.
I re-opened the ticket by attaching a new note to it, and added “hey, I JUST bought Elven Hair (here’s the order number), could I also get refund because I’m buying Elven Hair for GENESIS that came out today”.
Couple of hours after doing that, Britney replied and gave a refund, along with an apology and explanation of why Zendesk fouled up, which made sense and all was good again. I thanked and wished her nice summer.
So, yes, DAZ *does* honor that 30 day thing.