He says it as if it isn't part of the role he's already agreed to take on. Does she think he's the best person to act as a diplomat to other covens? Probably not. He'll have to tone down the 'English magic' references whenever he talks to any covens outside of England, if nothing else. Will it get him out of her hair? Yes. Sylvia controls her expression, giving an oblique nod.

"I should hope not, since that is your job. I'm sure Peter can give you some good advice on the day-to-day work. You'll be the voice of all witches. It's an honour and a privilege, and I look forward to working with you."