Don't be despair. I doubt the engine seized up. I had experienced worst - oil chain snapped and I kept driving without noticing it, engine seized, period. I have since overhauled the engine with the block in the car so anything is possible.
I suspect you have a fluid lock in one or more of the cylinder. This is what I would do, remove all injectors and spin the engine, if it can be spun at all. If coolant or fuel comes out from the hole then it was fluid lock. If it would not spin then it IS a serious problem. Turn to turn it by hand and see what is binding it.
I also doubt the fuel somehow ends up in the crankcase. It is possible but not in the volume you are talking about. How can 1/2 a can of diesel purge fill up your crank case. It is physically impossible.
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