isn't like 10% of chinese population party members? How many employees has Bytedance in total?
And THAT is a dangerous claim that mixes Chinese people and the ruling government/party.
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.