This depends on where you live, but if it’s the US (or a product from there possibly) it’s because they don’t count amino acid supplements as proteins. Since the amino acids aren’t linked together, they don’t get considered as proteins, and since they count the grams of protein to determine the calories, they get to say that there is 0 calories.
So in essence they’re just lying. The link below has a bit more info on 3 of the EAA’s, but the principle is similar for them all.
https://www.myoleanfitness.com/do-bcaas-have-calories/#:~:text=Simply%20put%2C%20if%20a%20product,So%20there%20you%20have%20it!
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