That's basically the standard test method from most Youtube testers... I watch this kind of video for entertainment but do no take the results seriously. I actually think the lack of knowledge of some Youtubers hilarious, some even struggle to turn off real time protection to unzip the small army of supposed malware.
Most don't even check if the leftovers are malicious or were just harmless stuff that whatever product being tested was right in not detecting.
I remember one that complained the product being tested kept killing and blocking the python script itself as malicious 
