The agreement he's referencing is on the dealers page so it would only be in reference to the dealer's computers.
In any event unless they have a back door very unlikely they could access anything on your computer. Chances of that are about nil as it would require too many people to know about it and there is a very good chance that such a scheme would be found out rather quickly. I'm not saying they can't do it but on a very big scale very unlikely.
I'll provide an example, back in 2005 Sony was installing rootkits
without the users knowledge. A root kit is usually undetectable by virus or other software. A rootkit could do what is suggested in the Beck piece and the Sony rootkit actually did to the best of my knowledge passing off information about the music files you had and listened too. They got caught because a security expert installed it unbeknown to him until he ran a check with a rootkit detector. His own software I believe.
Company was bought out by MS afterward. http://blogs.technet.com/markrussinovic ... o-far.aspx
What was really disturbing about that is it opened your box to exploits from the real bad guys..