No it hasnt that's bs. There's countless cases of countries being exploited by China and many have now started to fight back. Protests & much more have arisen in these countries.

https://www.google.com/amp/s/www.worldpoliticsreview.com/amp/articles/29594/the-controversial-china-sri-lanka-relationship

Sri Lanka owes 10% of its entire GDP to China. Its caused massive protests as a result. Sri Lankans are not happy with the loan shark at their door.

https://qz.com/1223768/china-debt-trap-these-eight-countries-are-in-danger-of-debt-overloads-from-chinas-belt-and-road-plans/

Oh & the list of countries is long. This is just the tip of the iceberg. Many African nations have now begun to resist chinese predatory loans and exploitation.

https://allafrica.com/stories/202105020154.html

Sorry but your claim of china debt diplomacy being debunked is not only false its blatantly a lie.

China has been using these investments to undermine these countries for some time.