I have the EK A380 ICE catalog with me, and it does not have 1000 movies, not even on the 380. They have 1500 channels, with each channel being a movie or a TV program or a game or a CD, etc. There are 500+ CDs alone, 200+ TV programs, 100+ games, etc.
EK certainly offers more "World Cinema" and Bollywood movies than DL ever could/would though.

The DL 777 had about 200+ movies a year or two ago (when I last flew on a 777), and I am not sure whether they have upgraded to the expanded catalog of 330+ movies (found on the 744, 763ER, A330). Perhaps the 15-20 you saw were only in the "New Releases" or one of the categories. I am very sure they have not gone back and reduced the number of movie selections from over 200 to 20!