In the section on conformance the reader finds the information about certain exemptions they may claim. The Note may seem contraditory, but it's just an attempt to alleviate the terror of reading the requirements of the first checkpoint. But that introduces conformance language in the checkpoint, and none of the other checkpoints have such language. And at least the form is consistent with the other content type checkpoints. I'll keep thinking about it, and I welcome other suggestions.
Some checkpoints govern others.
I think a new reader who visits the document, even if they read it thoroughly, will be confused by 1.1, and possibly come away thinking they have to support speech input. I think consistency is important, but clarity is most important.