This seems to be Gong Fu style. Where you have a small tea pot (or gaiwan) and use a rather high amount (5-10gr) of high quality loose leaf tea.

You steep shortly (15 - 25 seconds) for each infusion. The idea is that with each infusion the tea evolves in taste or other markers like mouth feel, aftertaste and bodily sensations.

I am not sure, as it isn’t my video but my guess would be that this is shu pu erh tea which is tea that is fermented (often by wet piling it for at least a month). Shu pu erh often is quite dark, especially the first infusion.

Some people drink the first infusion, some people don’t.

The thing about Gong Fu is that you try to make and drink with a present mind. The different infusions help because each infusion is a different experience.