According to Wikipedia (https://en.wikipedia.org/wiki/Chinese_Communist_Party) the CPC has 91,914,000 members in 2020. Which is around 6.5% of the population of the PRC or around 1.2% of the world population (assuming around 7.8 bil people).

Byte Dance has around 30k employees in total (world wide) according to https://craft.co/bytedance so by random sampling we would expect 350 employees to be CPC members.

So if they have 130, that would be less than you would expect from complete random sampling all over the world.

Of course that's a naive approach in many ways.