Yes, that's what happens. Start a petrol engine from cold and it immediately fills with fuel and condensation. Shut it off without getting the engine to temperature and that neat fuel and condensation remains in the engine. It is detected by the lambda sensor in the exhaust and this prevents the engine from being restarted and blasting neat fuel into the catalytic converter that could destroy the cat matrix. This has a secondary benefit of preventing the engine being started when the oil lubrication in its bores is washed off by the neat fuel. So probably nothing wrong with your car. Everything wrong with the way you have been treating it. If you just leave it alone for a few hours it may clear itself and start. Another possibility is that an engine with dirty oil does not immediately pump up its hydraulic tappets and by the time it does the engine is awash with fuel so the lambda sensor and ECU will not let it start. Older diesels are more tolerant of this treatment because diesel fuel itself has some lubricity. But modern diesels with particulate filters don't like it at all because the filter can get blocked.