Their actual English name is the Communist Party of China. CPC. There's no reason to call them the CCP. I have theories about why US sources do that, conjuring up Cold War ghosts of the CCCP, but the fact remains that they're wrong.

It's like how, in the US, the Democratic Party is sometimes called the Democrat Party. It's not necessarily meant to invoke hostility, but it very often is a dog whistle. We've just, unfortunately, gotten used to it.