Melvyn Goldstein is one of the most famous Tibetan anthropologists. in the 90s, there was a ton of atrocity propaganda about forced sterilizations in Tibet, almost exactly like what's currently being alleged in Xinjiang. Goldstein's research essentially disproved it, and now even Tibetan exile organizations largely accept the reality.
https://sci-hub.se/10.2307/3182072
https://savetibet.org/new-report-disputes-charges-of-forced-family-planning-in-tibet/
especially nice is on page 24, they describe how women in Tibet have essentially the same fertility rate as indigenous Tibetan communities in Nepal.