Both of the studies linked to at the top of this post, on which the entire post is based, have been discredited. Even if they were true, I think it was a stretch to go from those to postulating a generalized verbal overshadowing bias.

With the benefit of hindsight I can say that this post was probably a mistake, which leaves me a bit dumbfounded at its karma score of 61 and endorsement by Newsome. When I scrolled down to the bottom I saw that I had already downvoted it, which made me even more confused.