You wrote...
Why would he have engaged in reparative therapy? That’s for the people who have the problem, not the pastor?
Perhaps the wording is confusing, but I interpreted Cortez's remark that he felt he would have destroyed his son by enrolling him in reparative therapy to overcome his son'a gayness.
No matter really, the whole article is about a morally sick reprobate homo father leading not only his congregation astray, but even more so, his own 15 yr old son
If we were to look at it in a more charitable but still Biblically sound way, you could say that it’s someone who is or was faithful, but faced a test of faith and failed it.
Whatever the case, prayers for this man and his son and congregation to escape this noose of sin.