While I would love to be able to argue this case I can’t. Now, the author uses the term “modern homophobia” but never defines the years. But I sincerely doubt “ancient homophobia” merely converted when eugenics came along. And the problem with this theory is homophobia is older than eugneics.

For instance, Heinrich Hössli responded to homophobic ideas in his ros: The Greek Love of Men. It’s relationship to History, Education, Literature, and Legislation of All Ages which was published in two volumes in 1836 and 1838. Yet eugenics is largely created in the late 1800s.

In the 1860s we have classical liberals such as Karl-Maria Kertbeny writing about homophobia and publishing essays on equality of rights. Kertbeny invented the terms heterosexual and homosexual specifically to have terms that were value free and not inherently homophobic and he did that decades before eugenics came along.