Though this guy seemed really sick so him taking his own life doesn’t seem insane. Does boeing have the ability to infect people with MRSA?
But as far as I know it is very treatable by knowledgeable medical professionals if caught early so in that sense it's not a guaranteed attack-vector and a poor choice for an assassination. Depending on a target who doesn't visit the doctor until too late, maybe less of an issue.
Assassination seems unlikely here to me. The presentation of sudden illness with multiple agents flu B, MRSA, and strep all at the same time is unusual. The presentation probably IS consistent with a sudden exposure to a very high number of infectious organisms into his lungs which could overwhelm the immune system and potentially lead to death. It wouldn't be impossible to orchestrate but it sounds difficult, finicky, unreliable, and tough to correctly execute without collateral damage. It would almost certainly require a state actor.
It's also plausible he contracted influenza B and suffered from an opportunistic infection of the lungs.
By Occam's razor I think the latter is quite a bit more likely.
And yet, it worked.
Reminds the old soviet ricin umbrella injector