"No True Scotsman" is not accurate here. This would actually be an appeal to authority.
But the fact that it is one doesn't mean it has no merit. My implication is that the person I am responding to is ignorant of the state of the law, not that they must be wrong because others say they are.
There was no reply button. No it's definitely a True Scotsman. When you cherry pick what authority to quote, and therefore imply it's the only true position to have, it's a true Scotsman. Your next line affirms this.
"My implication is that the person I am responding to is ignorant of the state of the law, "
And now you've moved onto the Courtier's reply.