"These parameters" being the content of said speech.
It's not a conflation of two separate arguments. It's one argument. You're the one trying to separate the act of speaking content-free gibberish from the concept everyone else refers to as "free speech", and that is disingenuous. If we're talking about freedom of speech, the content of said speech is what's relevant.
Which is why it applies to things that AREN'T explicitly sounds made by one's vocal chords, and includes newspapers and other print media, and so forth.