I've been witness to some of the sort of chats that the AFP have with people of interest. My best friend was from Indonesia, and had some serious and seriously false allegations laid against him. The AFP contacted him to make a time to come talk to him about what was going on. He asked me to be there both times as both support and witness. A Victorian police officer and an AFP officer came to talk to him on two occasions about what was going on, separated by a couple years. It's one of the tactics of police in Australia I find admirable, to get a handle on a situation before it blows up. Of course it also says, "We're watching you," but these guys were seriously respectful in how everything was handled.
Now, I am most definitely not the most police supporter kind of guy. Anyone with a gun has an unfair advantage in my book, I steer far clear of them (police or not), and I have referred to police as "the Occupying Army" for many, many years. I don't hate them, but I don't trust them, because I don't trust human intentions and the drive behind them (which also means we need armed protectors like the police - conundrum). The kid was smart not to meet them in the station. However the details of the police story in this case square with my experience of police in Australia. There is absolutely nothing suspicious about them trying to arrange a talk with him. They do it all the time. In addition, if the allegations of up to three people being involved are true, and the boy who was shot was planning on beheading, there will be independent video footage which will most definitely surface.
I really hope there will be a clear and open inquest into this so that we will have something other than presuming and assuming. I would imagine there will be video footage from the police station outdoor cameras.