If I'm understanding you correctly, Mirroring is simply about repeating, verbatim, the last part of what someone said, right?
E.g. you are on a business meeting and your counterpart just took his glass of wine and sipped. Mirror it and sip your wine a few seconds later. Or do it with your hot date.
Mirroring works. Most of the time.
As apparently does using someone's name. Most (not all) people like hearing their name. Try to find out if they like or dislike hearing their name and either use their name a lot or very very seldomly.
I.e. for most people even in a 1 to 1 conversation say "Thank you Brent" and not just "Thank you".
If you’re pitching me your new product you get one “that’s a great question” and one ridiculous insertion of my name before you get a hard no.
Coincidentally these crappy tactics usually go with crappy products so it’s an easy win.
I think that can work in text.
(Or repeat the things you want to hear more about. And s/he will tend to understand and talk more about that.)
On a side note I found the book to be interesting, and I used few of his techniques to negotiate price of my now current house.
Which can be the last things, or not.
It's not enough to be a parrot -- one also need to understand the other person's perspective: what among the stuff s/he said, does she care the most about
(At least how I remember it)
Sounds like a candid camera experiment waiting to happen
Anti mirroring the interviewers / recruiters during an interview