Found it; was on different thread BTT
https://freerepublic.com/focus/f-news/3951552/posts
Clicking that link in the OP:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/
Shows it was retracted.
But clicking this link shows it’s still there:
https://pubmed.ncbi.nlm.nih.gov/33303303/
Defense Secretary Austin says the military has no plan to shoot the tumbling Chinese rocket-stage down but hints at US capabilities in space to do so.
https://gab.com/WhipLash347/posts/106190195423645673