Yep, you're right that it is aulonocara hansbaenschi. The red shoulder is not the same thing as a german red which is the blue face and red body where as the red shoulder is the blue body and red shoulder.
x2.
FWIW, in the "german red"-type peacocks, you'll find some coloration variance among them. Some are brighter and some are darker.
As for using Youtube as a fact-finding mechanism, unless the person speaking is well known in the hobby or has some very good scholastic qualifications, I wouldn't trust much of anything on Youtube. Every idiot with a camera phone posts stuff on there and the amount of inaccurate information I've seen is astonishing.