Exactly. It is used here as a form of false politeness, as in the expression of a biting sarcasm. It basically means the equivalent of Shut Up and Go Away..
It means the question or issue is not subject to any questions. Any fact indicated or claimed is final that That---Is----That, Thank you very much.
Of course, even in this usage it can be an indication of various degrees of coldness.
It can be modest in its expression, as it appears in your book. Or, it can be spoken as a veiled threat, meaning that someone is about to slap your face if you say another word.
. I have answered this to the best of my ability, thank you very much.
I would write more, but thanks to the need to work so hard, I am now exhausted,
thank you very much.