First rule: never trusting blindly to something which is on Youtube or trusting to the stupid comments and descriptions available in those videos.
This one was the first time I heard about this paccafe and so I made a quick search on google and as usual this is one of the tools that don't have a homepage, a description or more details, the only informations about it are the stupid comments of people who casually know how to turn on their pc.
Anyway the job of this tool seems to be related to the usage of the encrypted gcf of steam or something similar.
So I continued my search and I found that cs.rin.ru has a full and maintained list of games downloaded from steam and already decrypted and ready to use:
http://cs.rin.ru/forum/viewtopic.php?t=46055
So I don't know if Steam can identify and consequently ban this pacthis/pacthat (and I have no intension of trying it for various reasons included the absolute lack of interest in the entire matter) but naturally Steam is updated frequently as much as the authors want so they have more chances to study and take solutions versus an unwanted program, moreover if this program needs steam to work