The article did not give enough details to determine if it can be viable option or not. The first problem off the top of my head will be how many times can the system be regenerated before it fails. Another is what is the efficiency loss after regenerating? Nothing is 100% efficient and everything loses capacity as it is used. Also the dumbass writer talked about installing it in water pipes and pumping seawater directly into a building, which means you will need a dedicated maintenance staff to remove the filter for regeneration on a regular basis. Another is what is the cost to manufacture? Does it use a lot of rare, expensive metals?
I see the same hype I saw with the first non lead-acid batteries back in the late 1970's. A LOT of talk about how the nickel hydride batteries were a game changer, then nothing after it was found they became bricks after a few discharge-charge cycles. In my old cynical engineer's brain, I bet this new wonder substance meets the same fate.