Bilibili started banning all the CZ-10B streams, but it's clearly not a policy from above because there are heaps of streams on douyin, just platform being stupid.I can't get past the sign-in. The link somehow didn't go through.
I guess this alternative site will do too.
I suspect that's not the actual count down just some recording played by tour guides for atmosphere.There was an interesting thing that happened right at ignition. The count down went to zero and ignition was called, but seems the engines weren't lit because there was a bird? After a while then the engine came to life and the rocket took off.