Well from an educated guess, I would say that those posted statistics are very close to the actual statistic.

I.e Weapon stats for a Pistol displayed to the public;
Fire rate: 0.2
Reload: 0.3
Freeze: 0.4

Actual Weapon Stats to avoid hacking:
Fire rate: 0.200001472
Reload: 0.299999456
Freeze: 0.400001736

As for Ol’West and from experience, this is not a method they currently use on all weapons

Although I have been out of this thing for a long time now, so if era have found a way to detect the alteration of gun stats from the client then there’s is no need to hide gun stats anymore and ignore everything I stated above ¯\_(ツ)_/
It certainly used to be true though