Does it not give you pause when you write things like "it's just ChatGPT. Your own attempt at ending your life hasn't seemingly taught you anything."
Suicidality is multi-faceted. It's why there's recorded records of suicide attempts increasing when a highly-publicised suicide attempt happens, or when media portrays it such as in 13 Reasons why.
And when you're straddling that line - as you might imagine - your sense of rationality is sort of all over the place.
As with probably a lot of other influences in his life the responses of ChatGPT probably tugged him in a direction. And that alone is horrific.