If they had repented of it they wouldn't have followed thru and killed themselves.
Lets try your logic with other sins, like adultery. Someone saying, "Lord I'm going to have sex with my neighbors wife. I hope my wife doesn't find out, but if she does please don't let her be hurt too bad. And I ask you now to forgive me for the sin of adultery that I am going to commit later tonight. Right now, Lord, it's party time and then later I'm going to bed that woman but please forgive me."
The above is NOTrepentance. It is a head game and the adulterer is impenitent and unforgiven.
Or try this one, "Dear Lord, I'm gonna take my shotgun and blow whoever's head off. But before I blow their head off, I ask you now to forgive me for the murder I'm about to commit."
I just reread my post and it sounds like something off the Jerry Springer Show.