You're far out of your depth if you are linking the Wiki article on "Socialism" to a Marxist that is recommending a synopsis on Lenin to you.

If you want something a bit easier to get into than Lenin, I really like the article What is Socialism? It's a quick, 30 minute read. The gist of the article is that Socialism is about what is dominant within a system, in Socialism central planning, public ownership, and the proletariat at large are dominant, while in Capitalism the bourgeoisie, private ownership, and markets are dominant.

In the PRC, the public sector makes up half of the economy and is growing, and Capital is trapped in a bidcage model while markets coalesce into monopolist syndicates, making themselves ripe for public ownership and central planning. The PRC is therefore Socialist.