You are assuming there is no motive for someone in his circle or that he personally knows to commit this kind of crime.
>Occam's razor is a safe starting point for this situation.
The simplest explanation is he wasn't targeted and it was just a random mugging where he didnt want to hand over a few $1000s in belongings under the threat of violence?
But yes, it is absolutely the most likely occurrence that an obviously wealthy exec, an older man, was an easy mark for a random mugging gone wrong at the wee hours than some crypto bro plotted an assassination.
"Mugging gone wrong, someone got stabbed" is a very, very common situation. Also note that he lived to receive initial aid and perished on the way to the hospital - it's not like he was shot and stuffed in a car trunk.
Case closed, mugging. Occam's razor.