Are most libs just this ignorant or is there some sort of narrative/propaganda behind getting the name wrong?

It is both. Most libs are simply repeating the terminology they hear being used, but the reason CCP is used almost universally in Western propaganda is because it has a better rhetorical alignment with anticommunism - where "Chinese Communist Party" reads more as an overt dictatorship compared to "Communist Party of China" which reads as a party which stands as a distinct organization in relation to the Republic.

The goal is to eliminate any potential nuance about the political machinations of the PRC and discuss it as if it were a pure autocracy whenever possible. This goes hand in hand with describing any Chinese policy as if it were dictated by Xi Jinping himself, with almost no discussion about officials in the National People's Congress, the judiciary, or various state and provincial administrations.

When discussing the political failings of the US, we always have a rotating villain to blame. We have a tautologically benevolent form of government which is constantly being undermined isolated cases of corruption. This time it was the parliamentarian. This time it was Joe Manchin. Oh we had a good bill, but it appears the Supreme Court shot it down. Oh man it looks like the Governor of Texas is going rogue. It is never a failure of liberal democracy. When discussing the politics of our 'adversaries,' we do the opposite. Everything we choose to report happens because of communism and communism is bad. That is all you need to know about it.