This thing is just a fresnel lens page magnifier and a piece of cardboard to hold it up. There is zero chance that it will effectively magnify a phone's screen in a way that will be comfortable to watch video on, and the claims of "Full HD Resolution" are outright lies if they're referring to the magnified image and not the original phone screen.

Also you can already buy basically the exact same product on Amazon for $25. So it is pretty likely that these guys are just reselling some cheap made-in-Asia junk.

EDIT: Also just look at these fake-ass comments

https://imgur.com/S0aH7BY

There is zero possibility that these were left by actual customers and not people who are involved in the project.