Well, MRJT purists are free to turn their heads in disgust: ATR can safely negotiate approach at -11° flightpath angle. However, there is very strict way to do it, which results in safe and predictable arrival. Main points being: daylight VMC with runway and all of the surroundings being visible all the time from starting of the dive and aiming short of the runway to intercept normal glidepath at 200ft latest.
These guys messed it up royally. Landed long after diving all the way to runway.
Oh, and landing with a guy standing in the forward cargo compartment is criminally negligent, posting proof of it on YouTube is demented, to say the least.