You might wonder why "player" and "parse", but not maths, and others? This is for a couple reasons especially the second reason, the first reason is that calling these two functions means communicating with CS2D API which causes a little extra delay. The second reason is due to the way "player" and "parse" have been programmed, as someone who has contributed to some reverse-engineering projects of the dedicated server in the past, I can tell you that there are hundreds if not thousands of conditions and statements that the game has to go through everytime one of the two gets called. That once again explains that actually localizing "parse" and "player" won't have any actual effect on it, just optimizing a little so it doesn't have to communicate with CS2D API as much, but doesn't do anything to the actual thing which is the design of the way "parse" has been programmed.
Localizing them is like removing a few conditions of the thousands from the "player" and "parse" hard-codded checks, it's absolute BS.