illegal queue jumpers to be relocated to perth detention, page-54

Yes, the Chinese have invested in Sri Lankan shipping. To be fair though, the Hambantota International Port in Sri Lanka doesn't host much in the way of small refugee boats.

As a deep water port operated by Hambantota International Port Group (HIPG), a joint venture between the Sri Lanka Ports Authority and the partially Chinese state-owned China Merchants Port Holdings, its use is commercial and eventually (through debt trap diplomacy) it is envisaged to fulfil the role that Ceylon ports had in WWII.

China invested in Sri Lanka to control international trade routes. A cursory glance at a map of the world confirms the bleeding obvious. China will make it a Chinese naval port. To control or withhold trade to countries that anger China.