Don't confuse yourself with the terms.
I'll quote a post by Darfy
Also everyone make sure you don't confuse the two terms "crouching" and "crouch glitching" which are two totally different things. Crouch glitching is still disallowed as clearly stated in the server rules.
And here is an explanation about crouch glitching by Hanney
Crouch-Switch-Glitching
What is it?: Crouch Switch Glitching better known in short as "Crouch Glitching" is when a player crouches with any firearm, fires the weapon then switches weapon into a sprinting position. This is a very similiar glitch to to "Switch-Glitching" with the difference being that the player is crouched when doing so. This can also be confused with "Rapid-Firing" which is covered below later on.
What Ultra_Killer did was just crouching, report
denied.
VC-MP: 
