If fuel can get into the tank from the filler cap, it can get out. The problem is that there is about a 45 deg bend followed by about a 90 deg bend and then another approximate 90 deg drop into the tank. Getting your siphon hose past those bends is the problem. It needs to be flexible enough to do the bends yet stiff enough not to bunch up in the bends. You can confirm that the siphon hose is all the way in by blowing on the hose and listening for bubbling. Your chance of doing this successfully is low.
If you don't want to access the drain plug, you could disconnect the inlet to the fuel pressure regulator and attach an extension hose to the hose that attached to the regulator and run this to a catch tank. Then make arrangements to power up the fuel pump and drain the tank that way. The pump's flow rate is about 2 l per minute so this will take about 1/2 hour to empty the tank so using the battery to do this may not be a very good idea.
Personally, I would use the tank drain plug rather than mess around with fuel line connections or trying to siphon the gas if you want the tank empty. The drain plug has the advantage that if there is solid crud in the tank the drain plug method will remove some / perhaps all of that solid crud.
'Engine won't turn over' is rather imprecise English. If you mean that the starter motor does not turn the engine over then your problem is something else that is totally unrelated to fuel. If you mean that the engine will crank (turn over); but, not fire and then continue running that might be a fuel system problem; but, probably not a fuel quality problem. The COV 19 pandemic was declared around March 2020. If that is when you stopped driving, the gas in the tank is about 3.5 years old. Gasoline definitely deteriorates with age and the engine will probably have poor operation on that gas; but, it should still be able to start and then perhaps run like crap.
Have you confirmed that fuel pump starts up and goes through the prime cycle to pressurize the fuel system? That would be a good place to start. I can't see a fuel pump failing after sitting unused stored in old gas for >3 1/2 years. If the fuel pump does not run and it is not the main EFI relay or the ECU that has failed then you are going to have to drain the tank anyway to access the pump. There are so many other things you should check first to evaluate a non start before jumping to the conclusion that it is the fuel.
Draining the tank and using the 3 1/2 year old fuel in your lawn mower or your neighbour's lawnmower would never be a bad idea. However, eliminate other possibilities before filling the tank up because if it is a dead fuel pump you are going to have to drain the new fuel out to access the pump.
