LD50 stands for Lethal Dose 50%, and it is the level at which 50% of a given test population shall snuff it. It is quoted in mg/kg - milligrammes per kilogramme and it should say 'body weight' or 'BW'. So applied to humans it would take approximately 25g to kill a 70Kg person 50% of the time. Or half kill or do some sort of Schroedinger thing.

That's why it's moderate toxicity - you'd have to drink around a shot glass of the stuff and given the taste of it you'd likely vomit it as soon as it got in your mouth. It has an odour threshold of around 1 part per billion which is roughly a tablespoon chucked into an olympic swimming pool of water. Typically it wouldn't be used in a flavour at more than a couple of g/kg. So given a dose rate of around 3g/kg of finished food you'd need to consume more than 100kg of the food in one sitting to get anywhere near the LD50.

TL;DR - you'd have to go to extraordinary efforts to die of mushroom alcohol poisoning.