In theory this is true,but find me a person who has won a claim based on this.
the idea is that VW has to prove that you messed up. you are innocent until proved guilty, so the burden is in them. If you can document that the oil meets 502.00 (or whatever the manual call for) and that the oil filter is OEM or equivalent AND that you know how to do an oil change, I believe you are covered. They would have to do an oil analysis of the oil that is in the car, showing that the oil broke down because it didn't meet the specs, and document this. same thing with the filter. Your ability to do an oil change can be proven by the fact that, let's say, you consulted technical manuals, you did many oil changes before and cars didn't get broken down because of you, you get info on this forum and others, you bought a VW repair manual that covers your car model and year, etc.
of course, if it gets to court, it is a mess and a pain, but i believe people are scared to fight back and that is why they don't even try.
bottom line: if you use good quality oil and filter, you won't have any problems, all this talk is just for your peace of mind, and also to educate you that if they makle a claim against you, it is not enough, they have to prove it.
k0