I'm not seeing anything related to Claude Code. It's the desktop and mobile Claude app with the same feature I've already seen in competing products. Voice isn't even available in the remote control mode of Claude Code.
Well, it's not mentioned at all in the linked page.
I tried /voice in Claude Code and it lets me hold space to get speech to text into my CLI. Not really what one expects from a "voice mode". And, again, not related to anything in the article.