The link is no not a peer-reviewed research in Nature, it is a "News Feature" written by "a science writer based in
Manaus, Brazil."
The cites for the tipping point are two editorials written by the same team of two researches in Science Advances, these are editorials, not research articles.
The research article claims that with a 40% deforestation the rain reduction will cause problems, but in the editorial they use hand waving to reduce that to 20%.
The cites for the tipping point are two editorials written by the same team of two researches in Science Advances, these are editorials, not research articles.
They cite https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/200... that is a peer-reviewed research article in Geophysical Research Letters.
The research article claims that with a 40% deforestation the rain reduction will cause problems, but in the editorial they use hand waving to reduce that to 20%.