I just can't find any reference of this. This is pretty common thing, ideas from a long time ago tend to stay in the publics collective memory as still being current.
The one that springs to mind is the "breathing" you see pregnant-in-labour women doing in hollywood movies (yet this technique was thrown out decades ago as having no effect at all). Yet it lives on in circles of people who aren't experts and repeat it amongst themselves as if they are.
A quick search didn't yield anything like this for Sapir-Whorf though.