Thanks for the links, it's interesting background. In that article from February 2021, The Artlantic states "There was also never a default".

There was indeed no default as of February 2021. The default occured later, in April-May 2022, so we can't expect a past article to include that information.

All major lenders need to take part in restructuring the debt indeed. That occured in 2023, and multiple lenders asked for a restructuring deal similar to the first one signed with China. I don't know about the US, but Japan/India/French lender were looking for a similar restructuration terms. That sounds fair to me.

A debt rework between Sri Lanka and countries including Japan, India and France was also expected this week, but news of the EXIM deal took them by surprise. The three nations request comparability of debt treatment with China.

"As far as the information we have is concerned, conditions set by China are comparable to ours," Kanda said.

The country's default is clear evidence the overall debt wasn't sustainable. Both Sri Lanka and its lenders have a responsibility on this. China is often the first mentioned because it was (still is?) Sri Lanka's biggest foreign lender, although it would be good to have transparency of the country's debt and interest rates on a per-lender basis, to see which ones are the most sustaonables.