In the first moment, I stumbled about that, too.
But the interview took place in July 2007 and David Trimble spoke of "August last year" - that would be August 2006.
I went "hmmmm" about that remark as well, but you're right; it isn't as recent as it seems at first reading.
It takes a while to get these interviews ready to use. It's a lot of words to transcribe from the tape recordings and we like to stretch it out and not dump all the new stuff on FB at one time!
(Thank you, to those of you who have been quoting bits and pieces of this elsewhere, for putting the link to FB when you did.)