Curse those Sisters... they have secretly been feeding me misinformation! Did you know "Netflix and Chill" didn't mean to relax in front of the TV? I embarrassed myself in front of the whole kindergarten class! SISTEEEEEEERS!
That is why it was a multilayered joke :D. Don't worry, its meaning was changing over the years, and now, depending on context, it can be taken literally, or as any grade of romantic event. Alone, with friends or romantic partner.