I don't think you absorbed the implications of the post. Whey is whey. "Concentrated" amino acids from whey would be whey concentrate, which is what it is. VERY concentrated amino acids from whey would be whey isolate. Even if the whey isolate were 99% pure protein (which is is not) it would still only be a gram or two of protein in a pill. Protein or free amino acids cannot be 'concentrated' in a way so as to put a substantial amount of it in a tiny little package. It is the other way around…you would need many many amino acid tablets, whether whey or free form, to equal one scoop of plain whey concentrate, which would be not much more than 80% protein, at the most, and maybe less. The idea that there could ever be a larger amount of protein in a little pill than a big scoop of powder (or a piece of chicken) is magical thinking. Undoubtedly you buy such amino acid pills and you want to believe you aren't wasting your money. Well, go ahead and believe it. If the undeniable reality of this post isn't enough to convince you, nothing will.
Instead of guessing, however, you could just use math, as the amount of protein in a pill, and the amount of protein in a powder, is revealed on the label. If you do the math and still wish to convince yourself that there is a "lot more protein in a pill" then you really are deluded.
Forget the pills. Let's do powder. I have an amino acid powder label in the post for all the world to see. This is not a whey concentrate but a free form amino acid. You said those amino acids must be "concentrated". Well, what is the largest amount of any one amino as per the label?
Well, it's NOT the α-Ketoglutaric acid at 450 mgs. That is just label dressing. Its an intermediary in the Krebs cycle and there is no reason to believe that taking it in supplement for does anything for you at all, except to lend fancy sounding chemical names to a supplement label and fool gullible body builders. So taurine at 380 mgs wins. That is 380 milligrams. A GRAM of protein is 1000 of those. So we need a little less than 3 of those taurine amount to get to a gram.
Now, adding up all the amino acids present in one serving of the stuff, we get 3400 mgs. That is 3.4 grams of protein (or amino acids if you prefer) per one 4 gram teaspoonful. The difference is the flavoring, starch, and sweetener. A typical serving of whey powder yields about 24 grams of protein. I don't have to GUESS to tell you that 3.4 is a lot less then 24. SO, you need about 7 servings of this amino acid powder equal amount of amino acids in ONE serving of whey. Those 7 servings will probably cost you 7 times as much. So there you have it. The mystery is solved.
By the way, I love Ovaltine and they list all the vitamins on the label.