if that indeed works as claimed, wouldn't that also sequester CO2 from the exhaust?

"Carlisle said testing has shown the system collects approximately 95 per cent of his equipment's emissions, and has reduced his need to add nitrogen and other fertilizers."

This seems to imply that it does. But I don't honestly know. It's novel ideas like this that I really like. Hopefully, the process works as claimed and becomes more widely accepted practice.