Syntax error.
You are not looking at the GCR, nor a part of it.
Part of the text of the Spec 944 rules is in the GCR. Spec 944 uses the GCR as a reference because many are already familiar with it and to avoid writing a duplicate lengthy rulebook.

I'm not knocking Spec 944, I'm a 944 guy, but I wonder if Comeau has SCCA permission?