Replica, actually nope you're wrong.
Using the system of bluring out was used maybe in early 2005s. The current hacks are taking screenshot throughout the whole game not saving it on database, however as soon as they see execution command on you, they immediately take a new screenshot, replacing the amx_ss one with a clean one.
I know what I am saying, I'm an ex hacker myself.
So tl / dr - Demos are still obligatory. Admins still must record demos. Screenshots count as evidence however, they cannot give us a 100% sure opinions if the guy is a cheater, whilst a demo can.