I don't follow you? Are you saying he took screenshots of the LFS cars while in game, and then added reflections in some photo editing software? I highly doubt that... but if so, wow, even more impressive!
Those pictures looks like the LFS cars are renders, and then placed on a photo background. This is known as a composite, and is still considered a render.
[edit]
OK, now I see. He took real photos and pasted in bits from LFS cars. Very clever, and a very good job!
OK, time to up the ante. I have now included motion blur to my pics - not conventional PS motion blur but some rather clever ones. I thought also that FO8s would be the perfect car in which to try the filters out on. Enjoy!