He's exactly right.
Let's take an example. A student pilot is departing an airport. He wants to climb faster - he wants more lift! So he pulls the yoke back as much as he can. His climb rate increases - but his speed falls off. When the wing reaches about 15 degrees angle of attack, he feels the buffeting of an incipient stall.
What should he do?
If he wants to get "the maximum possible lift force" as you mentioned before, he should pull back further. That will maximize his lift. Up to about a 40 degree angle of attack, more pitch up equals more lift.
If he wants to survive, he reduces the angle of attack. This decreases lift slightly but GREATLY decreases drag, so that he can keep climbing with the thrust he has available in the engine.
You almost never want "the maximum possible lift force" in airplanes OR parachutes.
Nope. Drag does not "make the air move in a certain direction" and it does not "create lift." Drag is the result of the aerodynamic forces acting to slow the wing. The front of a ram air parachute is open because the dynamic pressure caused by the motion of the parachute with respect to the relative wind keeps the canopy slightly pressurized, which causes it to keep its shape. That happens due to the momentum of the air, the pressure behind that air and the stagnation point in front of the wing - not because of drag.
If you sealed off the front of the wing completely and pressurized it from another source (a compressed air bottle for example) you'd get a very similar amount of lift.