Dude...
1. Look at the dislike bar
2. "Hi guys, here is my new Dota 2 Maphack. It works for Steam and it will never get detected !" -> Not possible
3. Try to write a comment on the vid -> Not possible, thats why there are just good comments.
4. Download yourself and check it with your local Antivir or/and Virustotal
This is Malware