Once you have the human body, it's as if you have the ferryboat leading towards enlightenment. Thus, this rare opportunity must be cherished. Saying suicide can lead to enlightenment is an excuse for the schemer's victimization of people. Suicide won't lead to completion. On the contrary, according to Buddhism, it would create the karma of killing.
Suicide is absolutely forbidden.
In the past, cultivators were against this one the most. I have read several books of Mr. Li Hongzhi. He strictly forbids both killing and suicide. Remember, people render a great virtue to help cultivators. Distorting and smearing cultivators and provoking people's hostility toward cultivators are destroying people.