Well, according to the article, the farmer modified his equipment and then noted the lessened need for fertilizer to produce comparable yields. So according to the article it worked. Doesn't seem to be difficult to scale -- slight modification to tractor exhaust -- and works with existing infrastructure.

Short term solution that adds efficiency and reduces demand to a depleting supply. Sounds like a win-win.

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.