The thing about Occam's razor is that what seems to be the simplest explanation depends entirely on how you subjectively frame the issue in question. If you think of it as "a guy killed himself" vs "a powerful and widespread conspiracy of Boeing and the cops conspired to kill him, make it look like a suicide, and covered up all evidence" then the suicide option seems "simpler"

But if you frame it correctly as "a whistleblower who was about to testify against a billion dollar company decided that right then would be a great time to suddenly and without warning commit suicide" vs "he got got" the latter is clearly simpler.

Simplicity is not really an objective measure of anything.