He did not offer an opinion about this.
However, if we work on a replacement figure of 80% of the silver, that leaves 80% palladium and 20% silver. Even if the fading of the silver is 50%, highly unlikely if the print is processes correct, that still leaves an image with 90% of its original Dmax.
If the replacement figure was 90%, that would leave an image made up of 90% palladium and 10% silver. If the fading of the silver is 50%, that leaves 95% of Dmax.