No, I mean it's forbidden to baptize someone again who has already had a Trinitarian baptism.
Looks like another priest that let his denominational hubris overrun his faithfulness to his creed, the Ecumenical Councils and his hierarchy. Some fault also lies with the Catechumen though.
It's a widespread problem.
Forbidden by whom? Orthodox, Catholic or what? I think one baptism should suffice, but if someone wants to do it again, what is the theological basis to forbid it? It seems to me it would be like renewing your marriage vows with a different person officiating.