At the open day they said still consider international if the locals were not fit (eg failed AC, did messy interview, or poor WG) in case if you got invite the WG and you got PFO definitely they will choose local as maybe your result/score came out similarly with new invites, so if someone invited imminently after you got the WG, that's the case of you are replaceable after in the pile of reserve list. They aren't going to reveal your score tbh which is irksome at some point, but yes that's how they approach.
