Faster compiling trick still valid?

I was wondering if the trick to speed up compiling smaller Game Modules as described here is still valid: How to improve compile times for a C++ project? - Programming & Scripting - Unreal Engine Forums

It doesn’t seem to speed up my compiling at all, changing something as simple as a string still takes roughly 2 minutes to compile!

Yes, it works fine

In that case related: Extremely slow compiling - C++ - Unreal Engine Forums