In a minute released yesterday, both the council and tribunal accepted that imposing the three-year order was beyond the tribunal's powers.
As the council had imposed two other conditions, which Bennett did not appeal, it did not seek any further orders to be put in place, a stance the tribunal agreed with.
As well as being de-registered, Bennett was asked to contribute $30,000 to the cost of the proceedings against him.
If he sought to practice again he would be required, at his own cost, to be subject of a sexual misconduct assessment test and also, for a three-year period, to advise any future employer of the tribunal's decision and its orders.
Bennett, who retired in 2019, began a sexual relationship with the patient, who was 30 years his junior, three years beforehand.
Although recognising the ethical problem and transferring the primary care of the patient to another doctor at the practice, Bennett still saw her professionally nine times when that doctor was unavailable and also continued to act as the GP for her children.
In its decision on the case, the tribunal said Bennett also concealed the true emotional and sexual nature of the relationship with his patient and misled the Medical Council.
"The Medical Council has a zero-tolerance position on such breach of sexual boundaries," it said.
"A doctor entering into a sexual relationship with a patient is at the high end of breach of professional standards."