The article does take storage cost into account (although it does kinda waive it away):
> If this impression is correct then the cost of capturing CO2 is likely to either dominate or in worst case be comparable to the cost of storage and utilization. Still, a more detailed analysis would be careful about this costing
> If this impression is correct then the cost of capturing CO2 is likely to either dominate or in worst case be comparable to the cost of storage and utilization. Still, a more detailed analysis would be careful about this costing