Omega Vision
Face Flowed Into Her Eyes
Here it is:
* T-canon,[2] or Television Canon[3], refers to the canon level comprising the feature film Star Wars: The Clone Wars and the two television shows Star Wars: The Clone Wars and the Star Wars live-action TV series.[4][5] It was devised recently in order to define a status above the C-Level canon, as confirmed by Chee[6].
So anyhow as you can see there are two ways you can interpret that, either its saying that the CGI movie and subsequent series are canon and implicitly including the older series or it doesn't include the series because the older series is non-canon.
So the idea that the earlier series is canon while the newer is non canon is completely baseless.
People hate Ahsoka so much that they construct this idea that the series is non-canon.