Netflix is one of the most popular streaming platforms in the world today and it is not too much of a surprise that this question was brought up by some users. This question is very easy to answer as soon as you understand what a projector does. A projector merely projects an image on a screen but you must provide the image for it. In other words, if you wanted to play a video game on your projector you would have to physically connect the projector with your video game system.
This same idea applies for Netflix as granted you have a subscription on your gaming console, computer, etc. and that same device can be connected to one of the ports on a projector, you can project Netflix with your outdoor projector.