I believe did indicate Tibet would have its own version. China will have its own version too, of course. That is why I put up a version from an American university scholar (born in America).
If you want I can provide a link a far more glowing account showing Tibet's autonomy (a Tibetan version of course

).
What is ironic is this position you have built says human rights are dependent upon an established autonomy. Inner Mongolia went from the Ching, to independent Chinese warlords, to the Russians, to the Japanese, to Mao so are invalid, while certain papers signed nearly 100 years ago make the Tibetans worthy of a drum circle and some smoke induced meditation before writing a scathing blog about China crushing Tibet.
Remember this whole "diversion" was a rolling of my eyes about the huge support of Tibet that has grown while others (who happen to have the same/similar religion, ethnic background, history are completely ignored. Hypocrisy.
Even the Tibetan version (not the watered synopsis you presented) acknowledges the Tibetans looked eastward and hosted an Imperial Chinese presence even from the 1700s onward. It is interesting stuff, if you are actually interested and not searching for debate points.
I can't postulate on the Mao question, I've never read a Chinese version. I do know the paper signed in 1950 that was used as a springboard for invasion was very similar to an agreement signed centuries earlier.
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