I agree it won't work with someone with TMAU. But I think a big issue here is that everyone automatically assumes they have tmau, i was one of them.
Also note that this is a 2 front approach. 1 being the stomach acid and enzyme supplements in generous quantities with every meal. The 2nd part is the strict adherence to the low FODMAP Diet. Alcohol is LOADED with fodmaps, especially beer. This would cause issues with me every time I drank.