Every so often he films a new girl, but ExploitedTeens has been going down hill for a long time. Because he no longer films girls on a weekly basis, he recycles old girls as if they were new.
His MO is to remove a girl from the member's area several months in advance. Since almost no one stays a member for more than a few months, when he does recyle the girl 6 months later,
the site members (at that point in time) think the girl is new.
And yes, I believe he still signs off with the "thank you for cumming/coming" bit.