Anonimity in Kali

As we know recently Anynomous have declared cyberwar against ISIS.

They have published tutorial for newbies for hacking, there they have said that Kali is not best for anonimity

"Despite what other anons and the internet is saying, Kali isn't useful to you unless you have your own server to work on.

The OS is broken and insecure, and is built for security pentesters.

Kali will provide very poor security unless you know what you're doing."

Is it true although Kali is special OS for hacking.