He's got dark DME in there and even the light likely has some unfermentables. The rye extract is about 15-20% crystal in addition (assuming Briess), PLUS the's another 1/2 lb. of crystal. That's a metric buttload of unfermentables! 1.019 isn't unreasonable in that situation.
I understand your points. However, to my knowledge, he also steeped/mashed actual rye malt, not rye malt extract. Extract would have made matters even worse but if he used rye malt... well who knows.
Finally, for whatever it's worth for future, copy/paste this into a Word doc then hit Save and/or Print:
And better luck next time.