I've only read your link there, but aren't you mischaracterizing it? The Chevron doctrine isn't what allows agencies like the FCC to make rulings like this, it's what protects their decisions from being overruled by the courts. That is, even if all the justices privately agreed the agency's interpretation had issues, they'd still defer to it. But without Chevron, in that case, they could overrule it.
In this case, considering AI-generated voices "artificial" for the purposes of applying a law seems obvious enough to me that I don't think the Chevron doctrine would apply, personally.
In this case, considering AI-generated voices "artificial" for the purposes of applying a law seems obvious enough to me that I don't think the Chevron doctrine would apply, personally.