That word 'obviously' is dangerous here. People vastly overinterpret online comments, especially when it comes to who's trolling (or astroturfing or shilling, etc.) They routinely accuse others of this when it turns out not to be the case. From a careful reading of their comments I don't think that user is trolling at all, but rather is telling the truth (and such data as we can find in the logs confirms it).

Now consider the downside if you're wrong. Isn't it obvious that posting like this is a terrible idea?

People with suicidal feelings often say things that don't make sense to others. That's a consequence of their being—for whatever reason—in an extreme situation. The particular detail they're expressing the most pain about can seem absurd, if you don't know what else it connects to. But if you were to find out what it connects to, you'd no longer find it absurd, nor would you feel annoyed or dismissive, and you'd surely feel bad about hurting someone in that position.

I'm thinking the same thing. I've never met a 25yo who complains about making $145K a year.

How are you so certain?