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: https://www.cendio.com/resources/docs/tag/architecture.html
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.