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It's looks like a meta analysis of other papers - are you questioning methodologies because you were unable to find them in referenced papers?
i was asking because i can explain the methodology, and it is dubious.
if you total all the inputs that go into a product (the water, the carbon emissions, the land use, etc), then you can see what it would cost to produce it if you made no other products. but that's not actually the environment in which meat dairy and eggs are produced.
the most illustrative example is cotton. cotton is not a food. it is grown for textiles. it wrecks the soil and it is THIRSTY. after you harvest the cotton and separate the fiber from the stalk and seed, you have seed left over. way more seed than you need to replant. cottonseed can be and is pressed for oil, but it takes much less processing to mix it into cattle fodder. why should the water used to grow cotton count against the water inputs for beef and milk? it's actually a conservation of resources. these industries are all interconnected, and trying to just put a singular value on every product in the absence of the context of its production is not actually useful in determining what would be ecologically responsible.