I also got Tetenal Goldtoner, but I can't find any answers, only some info in Rudmans book on toning that some toners generate halide that needs to be fixed away again.
Using toners to stabilize prints only works when the toning is carried far enough to make a significant change in image color. In other words a significant number of the silver atoms on the surface of the grains must be converted. Agfa Sistan does not change the image tone and is quite effective.