I have read this, but it isn't too revealing. 80 percent of buyers come from Asia, but it's not said which banks and funds exactly.

It's also unclear why they sell a bond in Canada that is listed in Hong Kong.

It's more a propaganda move that anything else imo, also because the offshore RMB bond market is invisibly small (around USD 15 billion in market cap: the onshore market is thousand times larger and exhibits lower correlation to other asset classes afaik, although it's unclear why this is).