The South Tower was struck more obliquely leaving one intact stairwell, but this was difficult to locate and descend due to the huge quantities of thick, black, choking smoke. At least 600 people were unable to find an escape route before the tower collapsed. Most of these people would have likely died of smoke inhalation if the tower had not collapsed.
My reference to 9/11 was, in my opinion, entirely apposite. On that day, nearly 2,000 people were faced with no choice other than the manner of their death. Around 200 people chose to jump.
https://usatoday30.usatoday.com/news/sept11/2002-09-02-jumpe...
I still think the number is likely nonzero (a word I chose to indicate it may not be a high number but it is not zero) and my earlier point is reenforced: they were forced into it by circumstance, and would have taken another path had it been on offer.
It was most certainly not a "peaceful death".
Edit: I will be honest, some of my reaction came emotionally from offense at the implication that theirs was somehow a "peaceful death" (your words). The USA Today piece you cited says it was officially called "homicide". That is accurate. Assisted suicide is a totally different thing.
Actually it's a perfect example of the other kind of suicide, not due to permanent illness so much as temporary circumstances that could be resolved and lead to the person not wanting to do that. That is something for which friends, family, and medical professionals ought to intervene.