He does warn that you should carry out research. Obviously, he just picked up a random list of mixers online and didn't test any. I can see there are some scam mixers in the list
https://i.imgur.com/6xrQOgJ.pngNext time, try to research and ask around before using a service you are not sure about.
This thread can help guide you with some popular mixers -
https://bitcointalk.org/index.php?topic=2827109.0Yes, he is advertising for fraudsters, albeit unknowingly, which is clearly wrong.
Yes, indeed. I've flagged that site as a scammer on various sites, including in the comments of the video, so hopefully others won't be scammed too.