My friend found/remembered an article from 2017, which is similar, but for the CDC. It doesn’t sound like it affected search though. archive.is/JLcc8

The forbidden words are “vulnerable,” “entitlement,” “diversity,” “transgender,” “fetus,” “evidence-based” and “science-based.”

I tried searching the terms above on NIH, and none of them, except diversity, take you back to the home page. CDC search seems unaffected currently.