Windows integration was removed in #7279, but references remain in the documentation. For example, this section of the TAG references Windows integration in both the image and text:
The text is fine as it references that the SSO mechanism can be used to integrate with external servers. That part is still true.
As for the image, that is a bit more subjective. One could argue that it references a more complete system overview. But it could also be clearer if we only include ThinLinc components in the picture.