The salt extraction pools can reduce the salinity to the salinity level of the input water. The amount of effort needed increases as you approach the salinity level of the input so it isn't practical to achieve the exact same salinity level as the input water. In this case the proposed input water is from the Mediterranean which is not too salty for life.

I'm not sure how much more salty the sea can be while still having a reasonable ecosystem and an also not sure what ratio of extraction pools to sea surface area would be needed to achieve that so I don't know if it is actually practical.