He obviously had a remote fob to get in, and a pre-cut blade (or a selection of blades) at the very least.
The older pin based immos can be quickly and easily bypassed and coded via OBD, on the older platform cars (ME7/EDC15, even EDC16 which covers a lot of the VAG diesels) you can even buy self-contained devices that plug in and remove the immo via OBD2 in no time at all. Didnt find anything for the ME9 TFSI though, but i didn't look very hard
To me that looked far too quick for a proper read/write of the immo data, so perhaps he had something similar or some kind of emulator?