Midtjylland and Brentford do lots of scouting. They don't just look at stats and find a player, they go and watch them play lots of times.
Probably where they get these stats from anyway (they record them themselves) as these obscure leagues they seem to be getting players from don't have the wealth of stats the premier league does. Even in the championship they don't record all this stuff.
The people who decide whether or not to sign the player will very rarely if ever watch the player. That's not to say they don't have people watch them to compile said stats.