1. (._.) I don’t think China’s doing that…
2. Because the majority of the population were serfs and subjected to obscene conditions and torture.]] The liberation of Tibet was largely peaceful because of peasant and serf cooperation.]] The majority of Tibetans do not want independence, with 90% of those between 1920-1940 whose parents lived almost entirely before Chinese policies kicked in saying they have a better life than their parents did.]]
3. China isn’t the only country in the DRC (you say “the Congo”, which is incorrect as it could quite as easily refer to the RC), but as a major trading partner they have been the most productive in ushering in improved conditions (the Congo struck a deal with China that would provide $6 billion in new roads, two hydroelectric dams, hospitals, schools and a railway, plus another $3 billion in mining infrastructure investments). Mind you that the video you linked is based on a book which blames neocolonial mining conditions on the U.S. and the West which assassinated African leaders who opposed their projects (something China has never done, and I ask you to read Kwame Nkrumah’s Neo-colonialism and his comments on China). Most of these mining operations were inherited from U.S., British, Canadian, Australian and South African companies, with China’s operations only “dominating” starting in the late 2000s.
4. Taiwan has been a part of China since before the 17th century. Imperialist Japan forcibly seized this territory in 1895. In 1941, the PRC issued a declaration of war against Japan calling for the territories stolen by Japan to be recovered. In support, the US and the UK signed the Cairo Declaration stating that they would aid in the recovery of the stolen land. Again, the US and the UK reaffirmed the Cairo Declaration in the Potsdam Proclamation. In 1971, the United Nations General Assembly Resolution 2758 recognized Taiwan as a part of China. Ever since, the UN has recognized the One-China Principle which is why Taiwan does not have a seat at the UN. "臺灣民眾統獨立場趨勢分佈", conducted by Taiwan's National Chengchi University, an explicitly anti-CPC source, in 2022, showed the following results with regards to the perspective of Taiwanese citizens on independence and reunification: (Status Quo as Autonomous Part of China and Complete Unification Compiled [part of PRC] : 63.4%) (General Support for Independence Including Status Quo Moving Towards Independence [not part of PRC]: 30.3%) (Non-Response: 6.3%). Here we can see that in public opinion, remaining a part of the PRC has over double the support to becoming independent or pursuing independence at a later date. I’m unsure where you got this idea of Tibet not being part of China or not wanting to be part of China, when the One-China Principle is the standard (you likely mistaking complete reunification, which is the PRC’s goal, for the only form of unity). Regardless, the U.S. is the one provoking conflicts with mainland China through Taiwan, either passing their warships through the SCS or handing off weapons to oppositionists. Funnily enough, Taiwan’s ROC claims parts of Mongolia, of which China’s supposed guilt was the origin of this whole discussion.
5. This is correct, as China was opposed to Vietnam’s occupation of Laos and Cambodia, which they termed “social imperialism.” This was a mistake, ushered in by the misguided policy of offering support to Pol Pot (which the U.S. did as well) as a result of conflicts with the USSR which I don’t need to explain here, but in the original context this makes no sense. You’re responding to a comment saying that China called certain areas part of China that weren’t, but China never claimed Vietnam (and why don’t you mention what the U.S. was doing there).
6. This is a complete mischaracterization, with the truth being that India is attempting to force colonial borders, with China resisting. I assume you just saw a headline with “border conflict” and made some unintelligent assumptions?
7. What do you mean by “officially?” Read this.

You could go on, sure, but I don’t see your track record of misrepresentation getting better.