Not sure how they could describe suicidality more clearly. Speaking as someone who has also experienced it due to chronic health conditions that had gotten particularly bad for a while.
It might start off with self-sabotage and end up in suicidal thoughts-- but also, maybe self-sabotage is yet another way to cope with extreme stress?
Given that Poe had chronic stressors (financial, for one), maybe his drinking and self-sabotage were the kind of responses his brain would generate. Even though he himself calls them "perversity", it doesn't negate the fact that he was experiencing severe brain damage due to the constant stress.
The TFA also elevates Freud into the discussion, but most if not all of Freudian ideas have been empirically refuted (thanks to the new advances).
While mine were not health-related they (the stressors) were equally as bad and ran on for years; I am naturally an optimistic person and have no addictions, and I live healthily; even so, the only reason I didn't take my life was because my religion expressly forbids it (doomed to Eternity if).
What the poster is talking about is different, something that occurs in a deep depression where your mind is struggling to find a way out of the situation. Sometimes the will gives out completely and you're just a zombie to the world, only slogging forward out of habit and maybe guilt.
What if suicide is a predator scratchpost response?
The more serious thoughts I mentioned earlier began surfacing after 15 years of extreme loneliness, which considerably weakened my mind, then on top of it, another five years of constant struggle against the most vicious stresses one can imagine (no way out, no matter what, but must find a way out). Towards the end of the fifth year of such chronic stress, these suicidal thoughts began occurring.
However, I must also mention that a few years before these thoughts, I also had a serious concussion (unable to walk for months, unable to read, personality change). I'm not sure whether these were due to concussion after-effects but the probability seems low, since there was gap of 3 years between the suicidal thoughts and my concussion.
I'm glad that (most) people are too civilised to do so.
I'm pretty sure the latter is really common. I've always thought it was my brain generating failure cases for risk assessment. We think "What if I dropped this bottle of water on my lap while driving and crashed?" and then we take more care not to drop it.