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He's wrong that energy is the issue. Yes it's expensive, but we can do it safely.
The brine, you cannot just throw back into the ocean, it will instantly cause a natural disaster if done at scale. For one, a lot of chemical reactions during the desalination process cannot be diluted, they must be removed. These chemicals are also not just removed with energy, they are removed with other chemicals who then need energy and more chemicals for removal.
The salt we eat and the salt we use on our roads or in our batteries are all very specific kinds. Only a small portion of the brine is what you would actually consider safe for human use or consumption.
With enough energy and chemical processes, we can definitely handle the brine. But it is the expensive cleanup part that no corporation wants to do, and it won't mean that the byproducts are profitable to manage, despite them requiring to be managed. We'll get there, but knowing humans we will have to wait until we are well embedded in the disaster to start acting. Water should be sustainable worldwide, not profitable.
Call me skeptic but I'll risk there are a good number of industries that could use and profit from using that brine.
And you opted by the chemical process. Why not use reverse osmosis or pure and simple forced evaporation?
The issue is that even at scale, they won't be able to undercut the traditional ways other companies already acquire these materials. The energy is just that costly. So in a way it is the cost of energy that is prohibiting capitalism to save us, but that's not the underlying problem if we knew what to do with the brine cheaply.
I did not opt for the "chemical process" per se, concentrating the salt itself causes chemical reactions and compounds that are difficult to manage, without us adding any to the mix.
They also often add some chemicals for stabilizing the brine to make it more manageable until disposal that would be difficult to circumvent
Not doubting your word, something doesn't add up.
There are hotels in my country that already buy and install dessalination plants, in order to save costs, to fill pools and fountains and even irrigate gardens.
These instalations have steep requirements to be installed and the off products can't be dangerous for return to environment, as the return often goes directly to the sea, through beaches.
Concentrating the salt is also another intelectual itch for me. We naturally concentrate salt by evaporation. There are a few programs aimed at developing low energy/high efficiency processes to obtain salt from sea water. The few I was described involved using systems built around the pressure cooker working principle or purpose built enclosed systems alike to greenhouses to force the water out. I'd risk the processes would be useful to make use of the brines.