It's not sophisticated logic, it's plain reading of the grammatical structure of the phrase. An adverb and adjective modifying a noun.
Haraway did not play a few games of chess as a child, she studied 7+ years to get a PhD.
I'm with you that gender studies has an evidence/science problem in general, baselessly attacking a researchers credentials does not prove that point.
- highly credentialed soccer player
- highly credentialed surfer
- highly credentialed linguist
and many more variants. All of the above would be misleading because clearly statements like "X is a highly credentialed Y" are usually assumed to mean that X's credentials are in subject Y. Since a persistent and widely known criticism of Gender Studies and the concept of gender is the severed link with biology in general, and the biology of fertility in particular, is remarkable, and it is difficult to believe it is done in good faith.
[1] https://monoskop.org/images/5/58/Haraway_Donna_Crystals_Fabr...