What is compilerOptions for?

The docs say:

compilerOptions
Used to selectively override compiler options for generating documentation. Values set with this option will override options read from tsconfig.json.

And there is an example of overriding strictNullChecks. But what does it mean to override strictNullChecks for typedoc? I wouldn't expect a documentation generator to be doing null checks, so I wouldn't expect that to have any effect. In general I am curious why this option exists / when you would use it. The docs / example are confusing to me as-is.