That is something thst is not in the quote.
Remember, Boney mentioned it as something that would not happen to most. If it provided resustance to all chais, then that seems like something that would be mentioned.
I'm just applying generally known knwolege of the setting to what the GM said, a Chaos God is the sum and total of his daemons. Unless the GM specifically speaks up against the notion in his universe I'm going to keep voting based on said setting lore.