I think someone should ask them that same question again and see how they reply.
You and Rich are thinking of the days when people would call the shipping centers and ask them questions. They would talk to the people whose only connection to the rules were that they sat around all day reading codexes because they had nothing else to do between organizing shipments. This person is not the same as them.
Further, a member on a discussion on BolterandChainsword about this emailed Paul S (I can't remember his last name at the moment), a name listed IN the Blood Angels codex and got the same answer. You gonna tell me he isn't reliable either?
I'm pretty sure I've found that even RAW supports that it's a blast, I just liked that this was extra support to it. And I really hope nobody at Battleground will ever deny someone their blast now.
As an aside, the 4th ed. BA codex (the White Dwarf pdf) never had blast either. I don't remember any problems being raised then.