Why does this say that they can't be used if you have VDC?

http://www.i-m-racing.com/nismo.html

 

Your mis-understanding. What it saying that on the 350Z Base & Enthusiast Models do not have the VDC...the other Models do! It's not about the rims!
lol

 

Why would it tell you that? How does that in any way pertain to the rims they are selling?

Read it again...
"For 2003+ 350Z (base and enthusiast model) equipped without Vehicle Dynamic Control (VDC) - (peformance, touring and track models are equipped with VDC)"

To me that says that they are only for Z's that do not have VDC. Which makes no sense either way...