That's just about the worst way to filter candidates. You are selecting for chatty people.
If you can't express your competency during an interview chat I don't see how you could be a good candidate (there are exceptions), nothing more damaging to a team that someone who can't communicate.
Being able to simulate extroversion for short periods at need is a useful life skill for any introvert - I've found it invaluable in plenty of situations beyond just job interviews.
Selecting only based on chattiness is not good, but filtering out people who cannot even chat is probably a good thing from a company's point of view.