I worked as an EM at Amazon. I went into this ready to think he had a bad boss (because those definitely exist at Amazon), but after reading this I feel like there's another side to this that has more compassion than is being reflected here. He was at turns informally warned, encouraged to take leave, and offered severance. It sounds like he expected a pass on all this for his life circumstances until it was too late. Without more details from both sides as to what the performance issues were, this reads as using a tragedy to get more than he's owed.
I can't even imagine what this guy went through. He had to watch his wife slowly die while raising two girls and providing for his family. Watching my father die from cancer after a long life was awful enough and affected me for years. His grief has to be phenomenal. I imagine part of his grieving process is lashing out at his boss for not being more understanding. That said, I think his story would be the same no matter where he worked. It's just more in vogue to bash Amazon.
If he wants to lash out at anything, I suggest lashing out at a system that requires us to work while going through such awful life circumstances. That man shouldn't have had to work. He should have been safe to be unemployed while focusing on being there for his family. The idea that he felt compelled to work to avoid his family going bankrupt is lunacy to me.