Because, the only thing we can know for sure about PC, from the transporter problem as it is usually phrased, is that an identical copy is a continuation of the self.
— Mijin

I don't think this is the case. The problem as it's usually phrase is designed to test your intuitions about what constitutes identity. — AmadeusD

I think this is the critical misunderstanding on your part, and is my response to all of your points in that post.
I was laying out what the personal continuity position is. The "you are transported" position.

No, it is not asking you to question whether an identical copy is you: that's the point of Parfit's transporter problem in the first place. PC is explicitly a response about such problems; it's making an explicit claim about what would happen.