Just like everyone else he drops tidbits of knowledge and tidbits of shit.
Take it like anything else you read - the author could be wrong. Doesn't mean shit that he looks like a striated dog turd wrapped in earthworms and saran wrap, if he's wrong, he's wrong. And the reason why I say he's wrong is because even if he's right, the adverse effect happens on such a minuscule level that it's asinine to sit around and debate it. People train fasted for a myriad of reasons and lots of people juice as well. I train fasted and I juice, so I don't have to worry if protein synthesis drops by a rate of 0.000000000000000001% per workout. Doesn't fucking matter in the real world.
People keep forgetting to stop looking at petri dishes and rat models. We're people working out in the real world with a trillion other variables. The studies are good for a reference and baseline to start poking around IN THE REAL WORLD. I could be wrong, just like anyone else. But the one thing I'm right about is that it doesn't fucking matter. Maybe if you're a week out from the Mr. O and every hormone in your body needs to be in perfect concert to get hard, full and peeled. But for everyone else on this planet they can go to bed safe and sound and not worry about fasted workouts and protein synthesis.