Excellent advice. I’d suggest the first year or two sow tillage radishes (daikons) thick. Their giant roots break up the hard clay soil and then you let them rot in place to add organics and nutrients deep in the soil.

But test the soil first. Get an idea of what heavy metals or other contaminants are there. Some soils can be remediated and made safe for crops, some are so polluted they’re better used for flowers and trees and native plants and wildlife.