That's the thing though, he may have an eye for goal but his finishing leaves a lot to be desired with so many weak and scuffed attempts in that video. He is pretty quick (not blistering but quick enough) and does seem to dribble well but looking at him I get a lot of Gervinho-esque vibes from him. Someone with pretty good feet, pace and trickery, but too tunnel visioned to make the right decision more often than not, and without the deadly finishing that can make a playing style like that worthwhile.
However this is just talking about his ability as it is now, which granted isn't really fair. He is still young and can improve a lot over the next few years. Hopefully he can translate his dribbling abilities to English football and improve on his decision making and finishing with age and maturity. So for 7m or so then yeah taking a gamble on him seems like one we should definitely take, so long as he isn't expected to be anywhere near first team material.