Cool surface cherry picking. Tibetans are one of the minority groups in China, as opposed to the entirety of indigenous peoples in the US which is the comparison being made. It also only highlights the language, disregarding the cultural and religious practices.

I do think it's awesome to keep languages alive, but that's not a whole culture.

In other news, indigenous peoples in the US have their own legal system that applies to their lands and which isn't easily infringed on by the federal or state governments. That's not true in China, so while they can speak their language they are still under other types of oppression.