If somebody writes about something in their suicide note, that easily clears the bar for "relevant for their decision making about their suicide" to me. What would the required evidence look like for you? Sworn testimony to a notary saying that it was KF and nothing else?
- Whether ongoing harassment from KF was relevant to their suicide
Unless one equates the mere existence to the thread itself with ongoing harassment then one can answer affirm the former question without the latter. The "required evidence" for the latter would require some sort of allegation that KF members were actively harassing Near at some point reasonably prior to their suicide, which afaik was just not alleged.