Maybe he just enjoys skinning cars? he has posted it in the skin thread stating he just uses the cmx viewer. At least he's contributing something to the community
If the demo players are doing textures for S1 / S2 cars, it doesn't mean that they're playing with the S1 / S2 license cars. I think in this forum are many people who don't play LFS, but they're just doing textures with CMX Viewer.
AE86 Render. Unfortunately I imported XRG instead of XRT and didn't realise until I was almost finished, which is a shame because I spent some time texturing it...