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I can confirm that the parts are purple in l4d2.
Only the tires have their textures.

I have assumed that the texture materials for the l4d1 models should be in l4d2 too since they ported the original maps.

Looking at the authoring tools they are purple and black there too.

Not happening in l4d1 though.

As a hackish workaround I changed the rendecolor to black for the purple parts in l4d2, doesn't look too bad since they vanish after some seconds anyways.

Updated the plugin in the first post, if you wanna try it in l4d2.