After working on the same task ~3 years back I will say: Be skeptical about results. Neural activity shifts over the course of days, and experiments without long term recordings will produce results which look a lot better than what can be obtained in realistic scenarios. As the article also mentions, there is a sizable question about the differences in signals when vocalization is not possible. I've seen some of that data, and in my opinion we're still a good whiles away from being able to use that data in any practical sense.