But, you triggered me lol:
1.) The Chinese meaning of "atheist" may not mean what you think it means: a.) it means not following a major established religion, and b.) they have an Orwellian surveillance-state dictatorship government which very much opposes major established religions
2.) For many people, including in China, astrology is just something like buying a lottery ticket, or asking the Magic 8-Ball for advice — fun, but not something actually believed in[1].
3.) It's much more likely that 3% of atheists "believe in" astrology[2] — and the idea that a majority would is insane on its face
So yeah, nah.
[1]: https://www.pewresearch.org/religion/2025/05/21/3-in-10-amer...
[2]: https://statmodeling.stat.columbia.edu/2020/04/11/42552/