I haven't heard anything to indicate that they are any less reliable than US numbers. US media is so anti-China right now, I'm sure if there was an issue with the numbers that they'd be all over them about it.
I use number of deaths rather than number of infections whenever I can because it's harder to hide dead bodies. About 10 months ago some US states changed their attribution criteria for COVID-19 deaths to try to lower the numbers, but you still have excess deaths that can be seen, even if they try to mis-attribute deaths to some other cause.
@Pat
What issue could there be? These are official numbers, and no one there is able to confirm or disprove. 😉