Does the divorce that occurred three separate times during the wife's pregnancy take effect, based on a fatwa issued to them stating its invalidity in this situation, and can subsequent divorces be considered effective based on that?

Divorcing a pregnant wife is permissible and effective by the consensus of scholars, and there is nothing in Islamic law to prevent its occurrence. The statement that it does not occur is a statement made without knowledge. If the husband has divorced his wife with three pronouncements, she is irrevocably separated from him (baynunah kubra) and is not lawful for him until she marries another husband.