There are no other sources. There are precisely zero western journalists in Tibet, the story isn’t covered in Chinese media, Hong Kong media, even Taiwan’s media.
Further more, even if I did find a source that said something other than the US approved narrative you would instantly decry at as propaganda. To people like you the only angle that matters is the one that confirms your bias.
None, at least none that you would find acceptable. I'm sure you already know the big names in English language media from China. You should look at them from time to time anyway, just to get a non-western perspective, but I doubt you will. Best thing of course is to go there and see for yourself, but you wont.