One huge glaring bro science mistake this all makes is that when people are used to supplying their body with carbs, lowering carbs will have a negative effect on protein synthesis. After one enters Ketosis,(using fat for energy) protein synthesis returns with drastically lowered insulin resistance, and a much more natural process of burning fat for energy by getting glucose as needed by fat conversion. This is actually why “intermittent fasting” works so well because the body switches to fat burning for energy faster than if you just cut down carbs alone. So people aren’t actually stupid if they think plowing down 500 grams of carbohydrates a day bad for you, it means they are informed.
The effect of eating carbs strategically is simple. Any carbs consumed raise your insulin level which normally leads to increased energy levels or storing fat. Here is a short video in which Jennifer Elliott, an Australian dietitian, explains such effects of insulin. However, post-workout carbs may have an anabolic effect and stimulate muscle growth (depending on the workout and intensity). This doesn't mean that you need to eat carbs if you want to gain muscles. Unless you aim for a significant muscle gain, post-workout carbs are not needed.