First of all, you should edit your post as you included your own text within the quote. I hope you don't want people to think you're trying to mislead other members...
In accordance with the Declaration on Principles of International Law concerning Friendly Relations and Cooperation Among States in accordance with the Charter of the United Nations, this shall not be construed as authorizing or encouraging any action which would dismember or impair, totally or in part, the territorial integrity or political unity of sovereign and independent States conducting themselves in compliance with the principle of equal rights and self-determination of peoples and thus possessed of a Government representing the whole people belonging to the territory without distinction of any kind.
Emphasis is mine. Please read this again as it doesn't show what you think it shows.
If a nation is conducting themselves in compliance with equal rights and self determination of peoples - the founding UN Charter - then the UN provides no authorization to dismember or impair that states territorial integrity.
Or in other words, if you contravene the UN charter, and dont permit the self determination of peoples, then you are, under the clause you provide, able to "dismember or impair that states territorial integrity" as those people will no longer be " possessed of a Government representing the whole people belonging to the territory " i.e. they no longer want to be part of that country.
There is also nothing, nothing, in the above that supersedes or trump the UN founding charter, which is what I asked for. So, to sum-up, the PRC, still recognizes the human right of self determination as per Clause 2 of the UN Charter.
If you're still unsure, then please refer to Clause 1 of the link you provide:
1. The World Conference on Human Rights reaffirms the solemn commitment of all States to fulfil their obligations to promote universal respect for, and observance and protection of, all human rights and fundamental freedoms for all in accordance with the Charter of the United Nations, other instruments relating to human rights, and international law.
Reaffirming their commitment to the purposes and principles contained in the Charter of the United Nations and the Universal Declaration of Human Rights,
All states, such as the PRC, must fulfill their obligations of the Charter of the UN = recognize self determination of peoples.
Do you have any other links that will support my argument? This one was very helpful,
OHCHR | Vienna Declaration and Programme of Action.