One singular study - You can usually find one to back up or cite one side of just about anything on PubMed. You will actually find a study on PubMed that supports that casein proteins cause cancer....so your probably going to die anyway.
I would not give it up so fast, this study does not directly reference the associated impact on insulin and the surge / sudden rise in blood concentration of amino acids......which is the whole point of the peri-workout nutrition protocol. The Biotest boys have always said that that Anaconda and MAG-10 are in and out of your system very quickly. It's a pulse!!
That all said....From personal expierience I am a convert to using Anaconda and MAG-10, I am on order number 5 of the Anaconda 1 Protocol package. It works, well: recovery, strength and muscle gains.