Producing nickel matte in this way is CO2 intensive, page-27

It is clearly answered in the article posted at the top.

"Tsingshan announced that it would construct a 2,000MW clean energy facility in Indonesia over the next 3 to 5 years based on solar and wind power stations. Although this timeline remains uncertain, it does suggest that Chinese investors developing nickel facilities in Indonesia are increasingly aware of ESG concerns from stakeholders involved along the supply chain."

They will offset by use of clean energy any emissions or energy usage which makes sense.

This to me is good, it shows they are willing to invest long term. The more clean energy around the world the better in my opinion.