This is a somewhat misleading description.

The first half is true. They bring in their FDEs to clean and organize your data.

But the difference in what they leave behind is what separates them from classic consultancies and pure tech companies.

They don't leave behind "insights." They leave behind a suite of operational (ie have write capabilities not just dashboards) applications that are "custom" built to actually solve those insights. I put custom in quotes because while the applications are usually bespoke to your company, they are built in Palantir's app-building product Workshop, which significantly lowers the cost of building these custom apps.

https://www.palantir.com/docs/foundry/workshop/overview

So in the end, your company's processes are improved because your employees are using the apps that the FDE's built.

This is distinct from traditional consultancies because those will only leave behind the insights. Also distinct from most SaaS because those have a one-size-fits all approach, so you wind up having to change your company to fit the design of the application, where as Palantir builds its applications to fit your company.