Maybe the authorities do know and it's simply not published/released? After all, assuming he shot himself and the gun is right there, it seems fairly reasonable to tentatively presume it's self inflicted.
Assuming he shot himself, yes, it would generally follow that it's self inflicted.
I'm unable to think of anyway in which someone can shoot themselves and not have it described as "self inflicted", even an accidental self shooting would be described by some in either form.
However, in general, with a gunshot wound and and a gun discarded right there some people might not assume that it was self inflicted and perhaps check for handedness, gunshot angle, residue, etc. before leaping to any premature assumptions or conclusions.
That wouldn't matter. If they really want to send a message, you get suicided with two shots to the back of the head. Having the entire media apparatus complicit in gaslighting the public into accepting absurdity is all part of the demonstration of power and demoralisation ritual.
So which one is it? So far as I can tell he didn't get "suicided with two shots to the back of the head", but despite that you still think the media is complicit in "demonstration of power and demoralisation ritual"?
Yes we all know the authorities do a terrible job of actual investigation instead jumping to assumption, speculation, and "gut" of their "experience" to intuit the "truth" of the matter with out any logic or reason..
Presuming and Assuming when it comes to a death investigation is often the start of how innocent people go to jail