That offshore wind could reasonably be built by the end of 2024 or 9-16 years earlier.
OK now compare like with like.
Will they be able to deliver an offshore wind farm which runs 24x7 whether the wind blows or not.
No, they can't.
So Nuclear, for Poland, is energy security in a solution to the inherent energy risks in a renewable energy age. They will continue to pay this money to assure their energy security until another viable solution, which does not require the reliance on power from another country, becomes available. Once that is available I would fully expect them to cease Nuclear energy build.
Let's talk apples to apples. Poland building Nuclear is nothing to do with how quickly and cheaply, you can put up Wind farms or the relative energy cost of average annual generation of wind energy.
It is what to do when the wind doesn't blow on a cold winters night, without having to be reliant on another country.
If anyone had been rolled over once by the Nazi's and a second time by the USSR, within a decade, they would think twice about trusting another country for their energy security.