No, it does not. Reading that is like reading "Null Physics". It is just gobbledy-gook that throws out fancy words that do not mean anything.
"...Since we cannot (even in principle) ever measure the oneway speed of light, Einstein concludes that the one-way speed of light is not actually a property of nature, but a choice of man. Before Einstein, we might have assumed that the one-way speed of light (and thus, the corresponding synchrony convention) is a property of the universe—one that we are not clever enough to measure. But according to Einstein, the fact that we can never test a synchrony convention shows us something fundamental about the universe. Namely, it tells us that synchrony conventions are not a property of the universe but are instead a system of measurement invented by man..."
Except, the "one-way"speed of light CAN be measured, and HAS been. Over and over and over again.