I worked on the Front End Engineering Design for a blue hydrogen power station with carbon capture, and I can assure you it generated net electricity export after subtracting the power and heat requirements for the CO2 compression and amine units respectively. So the phrase "It still appears that the energy cost of collecting, piping and injecting all the CO2 from a fossil fuel combustion or hydrogen reformation process exceeds the total amoung of energy that the process generates" is definitely not true. And contrary to common opinion, there is no "unproven technology" in CO2 capture and storage, every unit operation has been around for decades.
However your other phrase was 100% correct I think: "Underground storage of carbon dioxide from fossil fuel combustion has been over-hyped for decades and never convincingly demonstrated." I'm not 100% sure why that is, but I think it is probably to do with the lack of economic incentive combined with relatively little industry experience. If every Operator knew without a shadow of a doubt their Scope 3 emissions would get taxed at $100US per tonne CO2 then a whole industry would spring up and CO2 capture would become commonplace. But you don't get there with a smattering of plants across the world, with various incentives.
However your other phrase was 100% correct I think: "Underground storage of carbon dioxide from fossil fuel combustion has been over-hyped for decades and never convincingly demonstrated." I'm not 100% sure why that is, but I think it is probably to do with the lack of economic incentive combined with relatively little industry experience. If every Operator knew without a shadow of a doubt their Scope 3 emissions would get taxed at $100US per tonne CO2 then a whole industry would spring up and CO2 capture would become commonplace. But you don't get there with a smattering of plants across the world, with various incentives.