The entire article's premise is misguided as slow C++ build times are usually a result of inexperienced SWEs unfamiliar with the language's "fun" build rules.
In enterprise you are almost always under a pressure to deliver something asap, so some bad practices are just a natural consequence of that. They could have liked to do it differently, but then they would only be half way to delivering what they have already shipped. There are always tradeoffs.
