Weird that that whole book is spent arguing against guys who worked like 120 years ago instead of confronting the voluminous modern work. "Of all the book's references, a full 27 percent precede 1900. Another 44 percent fall between 1900 and 1950 (60 percent of those are before 1925); and only 29 percent are more recent than 1950. From the total literature spanning more than a century, the few "bad apples" have been hand-picked most aptly to serve Gould's purpose."
https://www.debunker.com/texts/jensen.html