Although lots of companies use common tools (let's say, randomly, Kubernetes), companies' infrastructures are usually a pretty unique combination of software and rules. The "infrastructure tooling" abstracts away those software and rules and allows developers to deploy "things" simply using the provided tools.

For example, imagining a company using Kubernetes, an infrastructure tool could be a web UI that allows you to deploy a specific application by simply clicking buttons. That tool would in fact deploy to Kubernetes, yet as the user that detail doesn't matter to you.

Comparison isn’t perfect but it’s usually good enough.