The odds of four engines failing at the same time due to individual engine failures is astronomical, for all practical purposes, impossible. Unless there is some common element shared by all four engines which failed causing the engines to fail (fuel, electrical system, computer controller, etc.), it is doubtful simultaneous engine failure is the cause of the crash.
I’m betting on bad or no fuel.
How about ice crystals in the fuel?
I was deployed to Uzbekistan at an old Soviet air base. The Uzbeks had a few Sukhoi Su-27’s which they would light off before dawn & spool up to full throttle for what seemed like forever before finally rolling for takeoff. Very noisy.
Asked Basops what was gong on & the reply was that Russian jet fuel had no anti-ice additives so the airframes were gotten good & hot before flight to prevent fuel starvation due to ice in the fuel.