No it's not poor. By most metrics it is a so-called emerging nation. It's gross GDP is the largest in the world, ahead of the US, which ranks number two in the world. But it's GDP per capita is still significantly lower than the US and G7 nations.
It's annual growth rate has been about 6% but it's recently slowed down. Not sure where it is now. By comparison the US growth is 2 to 3% typically.
So if I can use the class taxonomy, China is middle class but striving to become upper class like the US and G7 nations. Definitely not lower class and poor.
You should know that although the Communist Party is the only legal party in China, 80% of their enterprises are based on supply and demand, capitalistic. Some of those capitalist enterprises are US companies like KFC, Baskin Robbins, Hard Rock Cafe, and McDonalds, which you'll find all over China in the big cities.
Only their largest of enterprises are socialistic and owned and operated by the government. And by definition, they are socialist, not communist, even though the party is the Communist Party.