Is the triple divorce oath, issued by the husband against his niece concerning her not going to university, considered valid and an irrevocable divorce, and what is its expiation, especially given that he uttered it over the phone, and does it count as a second divorce for his pregnant wife whom he had previously divorced once?

If the husband swears to divorce his wife threefold if his niece goes to university this semester, and then he permits her to go, then if the girl goes to university, a threefold divorce occurs according to the majority of scholars. If she does not go, nothing occurs. However, if the husband intended that the girl should not go except with his permission, then no divorce occurs if she goes with his permission. If the divorce occurs, the wife is not lawful for her husband until she marries another husband, and pregnancy does not prevent the occurrence of divorce.