Admitting to a past feelings and actions is quite different than admitting to present feelings and potential future actions. Wishing it worked indicates the a possibility that they might want to try again.
No, it isn’t. People who have attempted suicide are often very closely monitored by family/caregivers/medical professionals for whether they are going to attempt again, for years, and can be subject to significant constraints if they give any indications that they are thinking that way.
Sure, but the comment of was about the illegality of suicide and the resulting jeopardy causing people who attempted suicide to say they didn't wish it had worked on a documentary about suicide (and presumably skewing the "stats").
I don't think that's the same as what you're describing.