. It would not make sense to me to spend the extra time and fuel taxiing to the longer runway and then use an intersection that gives you less distance than would be available on the closest runway 8R.
Unless there was a long conga line waiting for 08R departures.
If so 09 could be a short cut.
Even better, save more time doing an intersection T/O from 09.
Pure speculation of course, but can't see no better reason to do what they did.
