These are my beliefs:

China is a semi-periphery country: They are exploited by finance and by unequal exchange, but they also benefit from looking the other way when they import commodities from periphery countries like cobalt from the DRC.

China is undermining the monopolies on investment, IPs, and advanced commodities necessary for industrialization that the West has held control over, and in doing so they're making it easier for periphery countries to industrialize and free themselves from neocolonialism, which helps anti-imperialist struggle.

However, you should not make the mistake of assuming they're doing this because they're good, you'd be a really bad historical materialist if you believed that. They do what they do because it's in their material interests as a semi-periphery country. They've escaped the control of imperialism, so they're free now to act towards their own interests instead of being slaves to the interests of international finance. That is to be expected and is definitely an improvement.

The contradiction between the periphery and the semi-periphery does need to be resolved, though, they need to be united.

("You" here is an indefinite pronoun, not referring to OP)

The definition of imperialism used in this video is doubly flawed. First it requires that the nation be capitalist (which just leads into useless arguments about what China's economic system is and into arguments about imperialism vs sparkling exploitation) and it also requires that the exploitation happen outside the borders of the country being examined for imperialism (which is such a bad framework that it might imply that Israel isn't imperialist because they claim Palestinian territory). They could have ended the video with just that definition and then said that no matter what China does it is ontologically and definitionally incapable of imperialism, at worst all it can do is sparkling oppression. The video does go on to talk about how China is a lot better to foreign countries than the west is but oddly omits any mention of tibet or territory disputes around the South China sea, or what China clearly wishes to do with taiwan. The video is absolutely white washing china and making it seem like an uwu small bean who would never hurt anyone.

In not acknowledging the negative side of China it also gets in the way of a frank and earnest comparison with western imperialism and how China still is better (not blackbagging foreign heads of state for cheap oil for example). This makes China look bad, as if the truth of the situation needs to be covered up, and by comparison that the west is less bad.

This is a bad video.