Yeah I looked at this further. There is something wrong. 1 I think they may be referring to the 100% combo of highlight, shininess, and transparency. I don't think that rule applies to all channels. 2. There appears to be a GI lighting problem with indirect lighting it is the worst. Here are 2 renders. First with GI no indirect...turned off interpolation.

No need to think outside the box....
    Just make it invisible.