This opinion by Cutler is a mistake. ALA detoxes the liver, enhances bile flow and binds to free copper in the blood stream, so why should this create copper toxicity ? In fact: A sluggish liver is the root cause for copper toxicity and ALA helps the liver.
Cutler thinks that ALA makes copper toxicity because he observes the rise of copper in hair mineral analysis, but this rise is very welcome because it indicates that copper is leaving storage sites.
So in my opinion there is no problem in taking ALA in copper toxicity but be aware that ALA will also mobilize mercury and chelates it. Some individums are not able to tolerate even 1mg of ALA because of mercury.