Settling with power is a helicopter term, and is trained for in full-scale:

From FAAH 8400.10, Chapter 2, SECTION 5. ORAL AND FLIGHT TEST EVENTS IN HELICOPTERS:

E. Settling with Power. The applicant must recognize
and initiate immediate recovery from a critical rapid
descent with power. For purposes of this maneuver, settling
is reached when a perceptible buffet is felt or an
indication of immediate settling is detected. If this event is
prohibited in the operator’s aircraft operating manual, it
shall not be conducted in flight, but shall be tested orally.


Things fly by moving air down. This lift production has several aspects. There is simple deflection off the bottom of the wing. There is also acceleration of air molecules over the top of the wing, creating low pressure above. This also moves air down, since the air molecules are accelerated downwards via a curved path above the wing. There is of course also upwash ahead of the wing as air tries to move into the low pressure area above the aircraft. I believe AdamOne was making the statement in a general sense and was not attempting to limit the production of lift only to deflection. This is well understood now, though casual observers seem to think that one or the other theory is "wrong". They are both different aspects of the same overall lift generation process, and must be understood together to get a more complete picture. Air molecules are accelerated somewhat downward by bouncing off the bottom of the wing, and they are also accelerated downward through encounters with low pressure above the wing.