I mean, you’ve already been able to do voice searches on the web for years. At the very least, voice dictation has been a system-wide iOS feature for nearly 10 years now. And you could always use voice dictation to enter an AI search. The only thing that’s really different about this is the phone call-like UI.
As an aside, I don’t think I understand the concept of “AI search”? Is it AI generation or is it web search? The two seem like diametrically opposed concepts to me. The former is AI processing of web results to generate an answer (subject to the same limitations of AI hallucinations as any other AI generation tool, as well as the same limitations of Google’s quick info boxes), while the latter is an algorithmic listing of website results. I don’t really see how you can do the latter with “AI” (or rather, I don’t see how that would look any different from the user’s perspective, after all, Google is almost certainly already using learning algorithms in Google search)*.
In other words, I reckon AI is being used here mostly as a marketing buzzword.