While you are right that green hydrogen for natural gas replacement in furnaces and for most transport applications is ridiculous, green hydrogen for metals reduction, ammonia for industrial applications and fertilisers and possibly for shipping is economical at a carbon price of around $40/tonne of CO2. If Australia used renewable electricity + green hydrogen to upgrade 70% of its export ores to primary metals, the saving in transport cost, (2.4 tonnes of iron ore and coal to one tonne of sponge iron, 4 tonnes of bauxite to 1 tonne of Aluminium etc  can justify a price of around US$4/kg if the destination country has a carbon price of even $10/tonne.  With high productivity solar in Northern Australia and particularly on the West Coast where combined wind and solar will enable electrolyzer utilisation of 70-80% without storage $4/kg at or near ore deposits is quite feasible within the next 5 years.

I think you are confusing green hydrogen from the electrolysis of water powered by renewable electricity and the usage of CCS with steam methane reforming of natural gas (so called blue hydrogen route). Both can produce a clean gas that could be used in hard to abate sectors. Blue hydrogen can technically be produced with low emissions. 

Green hydrogen is being supported by 100's of different businesses from across the renewable energy value chain. Blue hydrogen is being supported by the Oil and Gas companies (and their investors) who want to avoid their gas reserves becoming stranded assets. I think both routes are possible, both routes have different investors who should be utilised to reduce emissions and help scale clean hydrogen as a solution to the hard to abate sectors that clean electricity cannot reach. It is likely that green hydrogen will prove the most cost efficient for reasons of technology scale and modularisation than blue hydrogen over the next decade (or even by 2025). I agree there has been some impressive marketing on the part of the Hydrogen Council to push hydrogen as a panacea for many end use cases that will in all likelihood go directly electric. In my experience of working on accelerating the clean energy transition for 20 years, economics will always win.