I wouldn't assume it. For one thing, the evidence is towards upregulation of the androgen receptor by use of supraphysiological levels of androgen. So that doesn't mean that an upregulation seen under normal conditions would also give an increment under those conditions.
Also, I have used acetyl-L-carnitine for a long time. Not continuously, though often for quite extended periods -- I probably was buying and using it for a year straight before Receptormax came out -- but a lot of the time, starting back when I was still a natural trainer.
I did find a noticeable benefit when natural. The biochemical/physiological cause, I have no way to know.
As a steroid user I certainly saw no fabulous boost such as your above suggested figures.
I took it then because it's a nice pre-workout CNS stimulant at high doses (really high), and I believe there are health benefits.
I take the Receptormax now as a steroid user because I still believe in the health benefits of ALC, Co-Q10, and R-ALA, and so if not for Receptormax would be buying these when I could afford them; and performance-enhancement-wise for the effects on insulin and glucose-uptake.