The ag lobby told him there’s an ocean of fresh water
I’d say that he just says whatever. If it’ll get him more popular and/or more money then there’s no need to figure out if he actually believes something or not. It usually is self serving in some way, truth doesn’t matter.
Heat pump installation doesn’t have to be expensive through it is. Try looking up what it’ll cost you in Spain to install a split level airco that can handle heating as well. That’s an air/air heat pump. Or check what it’ll cost you to just buy the airco/heat pump. Then compare that to your country. There can be crazy differences in what they charge you.
Subsidies, the installers will know about it, they can just charge more.
No idea of a solution. But do know people are paying way more than they should.