He used information from Bellingcat, photos and geo-locations, which he verified by going to those places. He saw exactly where the Russian BUK passed through, thus putting to bed any suggestion that it was a Ukranian BUK as asserted by Russia. He also talks to an expert as to whether the damage to the plane was from projectile (ie a Ukranian fighter plane as the Russians initially asserted) or a BUK which creates shrapnel type damage.
This 60 Minutes TV programme was screened in Australia only a few days ago and is a must watch, especially for those that are unsure as to what actually happened. It seems the Australians will not let this go, and with good reason.
This is a new wave of internet crowd sourcing of forensic detective work backed up by the MSM.
Related link: Michael Usher travels to Ukraine to track the missile that shot down MH17
UPDATE 20/05/15: The second video (part II) has been removed from this post. That video has been taken down due to a copyright claim by Channel 9 in Australia. If the first video disappears, the videos are still available through the link related link above. I really wish media outlets such as the Australian Channel 9 would think about making it easier for bloggers to disseminate their material by providing embed links the way You Tube does.
UPDATE 2: Something I should have added to this post, so here it is. A more in depth explanation of the methods Bellingcat uses to track Russian military activity (including the shooting down of MH-17, and the firing of missiles from Russia into Ukrainian territory). It's half an hour and well worth your time if you are interested in this sort of thing...
UPDATE 3: Damn, embeded video does not work. Here's the link to the page it originated on instead. Why can't everyone just put their stuff on You-Tube where embedding always works? Note, it looks like their servers are down. Oh well, I'll just leave the post like this.