You are missing the most important part of such a scheme: How much does it cost?
Wind turbines are not free. Pipelines are not free. Solar power plants are not free.
All of those costs are what prevent people from building the system you envision.
Food can be produced much, much cheaper with water from rivers than from desalination plants.
Electricity can be produced much, much cheaper from nuclear power stations than from wind and solar, and far more reliably.
They only tell the positives, never the negatives, and there are a boatload of negatives.
“You are missing the most important part of such a scheme: How much does it cost?”
It’d cheaper and a more logical option than what the lefties are proposing. I would take it a step further and have those desalination facilities run on nuclear power. Like subs, but on a much larger scale.