It’s for voice actors’ IP rights for AI and non-existent residuals, according to the article. It’s basically about the same issues as the writers/actors strikes.
Though it’s interesting because games have a legitimate use for AI voiceovers. I hope they can negotiate for per-title AI training and residuals, and not just eliminating AI altogether. The potential situational and reactive voiceover seems amazing for games - or even just having an NPC speak your unique name.
IMO the devs could stand to unionize and strike too. God knows gamers all have a backlog and many would hopefully support them for the long haul.