could the reason why this stem cell therapy is rarely mentioned by European,American experts
just be , because it's from China ?

I found an article from 2018 :
https://bronchiectasisnewstoday.com/2018/02/15/stem-cell-transplants-rejuvenate-bronchiectasis-lungs/
https://bronchiectasisnewstoday.com/ seems to have stopped updating in 2021

Boston University has an article from 2023:
https://www.bu.edu/articles/2023/stem-cell-therapy-lung-health-and-disease/
(just because a Boston researcher is involved ?! no mentioning of the
Shanghai studies)
It's mentioned in the 15 reader comments, though ... blaming the slow US-medical system

there were some threads and posts here in 2018 and two posts in an unrelated thread on Nov.1 2024