I had the same question.

There’s an explicit breakdown in one of the graphs, Suppliers and a graph on Price Per Method. They cover both obvious approaches to Direct air capture (DAC, Electrochemical Ocean Capture) and less obvious ones (BioChar, Biooil, Mineralization, Enhanced weathering, Biomass removal, Macroalgae).

I suspect that the inclusion of some on a reference dashboard will increase their legitimacy, and lower the case for approaches not included here. I also expect that companies will start favoring the cheapest approach.