It's just the typical toxic and illogical mix of homophobia, morality, and politics.
Ironically, same sex couples may actually be the key to alleviating the fertility crisis. Out and proud same sex couples tend to be of higher socioeconomic status, resolving the main barrier to having children. Yet, Draconian laws prevent them from accessing adoption or surrogacy services.
Also, China is absolutely cracking down on porn more broadly as well by shutting down websites, and jailing people, as part of its stance against "obscene materials."
China’s latest crackdown on porn has little to do with porn - https://qz.com/198932/china-latest-crackdown-on-porn-has-little-to-do-with-porn
He was probably just caught up in the satanic panic against Pokémon in the 90s.
The situation was so serious that the Vatican had to "bless" the Pokémon 2000 movie in an attempt to tell evangelicals to chill.
Pokémon movie earns Papal blessing - https://nypost.com/2000/04/21/pokemon-earns-papal-blessing/