Not yes and no. Simply yes, and not weird.
OP asked the question....
The answer, "It is inferred..." by myself, another, or most all that read and can properly interpret the section quoted.
For example, I could have replied, "I infer yes from the following section."
You are correct, the Code text did the implying... but not I.
So do I understand correctly? Simple yes or no.
"It is
affirmative that you can use 600V insulation for your equipment grounding conductor, when routed with current-carrying conductors that have to have 1000V insulation."
There are two main reasons why I would insulate my EGC:
1. To reduce abrasion of the remaining wires, during the wire pull.
2. To reduce corrosion, when routed thru structures made from dissimilar metals that could cause corrosion. Aluminum, galvanized steel, etc.
I'm not concerned about debating the meaning of the words "inferred" and "implied".