Is it considered one divorce or two, knowing that the husband uttered words of apostasy after an oral divorce, and without a genuine intention to reconcile, but rather to smooth things over, and reconciliation did not occur, then the official divorce took place thereafter?

The wife's reinstatement by saying "I have taken her back" is considered an explicit revocation (rajʿah) that does not require an intention (niyyah). Consequently, the wife has returned to your marital authority. Therefore, divorcing her again before the ma'dhun (authorized officiant) after this revocation is considered a second divorce.