Built-in hardware anti-aliasing does not work with HDR rendering in Unity

The document of Unity 2021.1 said Hardware anti-aliasing does not work with Deferred Shading or HDR rendering, but this hint was removed at the documents of Unity 2021.2.

so, what happened, what reason makes the hint come out and disappear for no explain?

docs for 2021.1 https://docs.unity3d.com/2021.1/Documentation/Manual/class-QualitySettings.html

docs for 2021.2 https://docs.unity3d.com/2021.2/Documentation/Manual/class-QualitySettings.html