All the perp's time on flight sims, without any known effort to even get a PPL (think Civil Air Patrol, community college, etc.)... shows long term calculation, probably obsession, with the Q as a coffin.
I completely disagree. While I never was an a simmer except very occasionally there are tons of people who love flight simulators and are aviation enthusiasts but for various reasons don't actually go to flight school, those reasons probably include they can't afford flight training, their health precludes it, fear of heights, too old to start, etc. Loving aviation does not require you to get a PPL, not everyone that loves race car driving games wants or is able to be a NASCAR driver, there are always more fanboys than people that actually pursue the career.
I got my pilots license (PPL) back in 2001. I could just barely afford to do it, and I knew I couldn't afford to get all the time and ratings to become a career pilot so long ago I decided to just fly for a hobby, as a recreational pilot. Not everyone aspires to or can afford to do flying for a living.
My opinion is that he was suicidal for mental reasons near the end, but I don't think that the hobby of flight simming was used by him to train for that, I think it just enabled him when he finally got to that point in his life.