Sorry, not true. The compressor is a pump, pumping a fluid against some head pressure. The simple fact, readily measured, is that this pressure depends on outside temp. As Joe Meehan alluded to. Distilled: high-side gauge pressure is proportional to ambient temp. Higher pressure demands more power output of pump, thus higher power draw.
With a window unit and a "Kill-A-Watt" you can see this directly. Excuse my ignoring the bogus physics/thermo. Rather, consider that an a/c is pumping heat from one reservoir to another, and the cost of doing that depends on the "vertical" (read: temperature) difference.