Basically what he means in the simplest of terms is:
If I'm on Voice Chat on FFXIV and invite a lets say Japanese-speaking Party member to my PT, there automatically is a language barrier, possibly forcing people to PT within their language group.
On the other hand, with the Auto-Translate function and option to type, then the language issues can easily be overcome with no problem.
A little better?
So you are of the impression that having voice chat means you can't type anymore?
Protip: Integrated voice chat or no: most people still stick to text in small group PUGs. I've played two games with integrated voice chat...even LOTRO where the quality of voice chat was better than that of WoW...had use of voice chat in small group content being the exception rather than the rule.
The bottom line is this: There's already going to be a language barrier no matter whether there is voice chat or not. The auto-translate function addresses that. Adding voice chat on top of that isn't going to change anything. The big difference will come at endgame when you've got to try and accommodate voice chat across two, potentially three platforms. Without integrated voice chat, you've not only got a language barrier in the game, you've got a platform barrier. Integrated voice chat addresses that.
So you've got auto-translate text features to address the language barrier and integrated voice chat to address the platform barrier. Looks like a win-win to me.