Can lift be created without air downwash? I was looking at the great site code7700.com, but I don't really understand their explanation of lift and drag:


     The so-called infinite wing
  displaces air for a while, but the air particles return to their
  original positions along the relative wind. The relative wind
  experience up wash as it approaches the airfoil and down wash as it
  leaves the airfoil. But the up wash and down wash are equal so the net
  effect is cancelled. Because of this, the aerodynamic force occurs
  perpendicular to the relative wind and their is no induced drag. In
  other words, all of the aerodynamic force is producing lift, none of
  it is pulling the wing backwards.  
  
  Source


It seems this is a big confusion. Could someone just confirm that lift is created solely by the downwash and Newton's 3rd law of motion? 

(Why air is deflected is not part of the question.)
If no downward acceleration occurs, there can be no lift.

However, a wing of infinite span will use an infinite amount of air for lift production, so an infinitely small amount of downward acceleration already suffices to produce lift.

Clearly, this is a thought experiment that cannot realistically be reproduced in reality.