These sort of controllers have already been repeatedly attempted for use in gaming for the past decade or more. While working examples do exist and are sold commercially, they just aren't practical, so they haven't caught on.

So I wouldn't have high hopes for this yet, because clearly the technology just isn't there yet to enable high-fidelity brain noninvasive brain interfaces. But it'll never get there without attempts and funding, so it's good to see DARPA work on this.

Personally I'm more excited for commercial applications of things like the synchron implant (https://synchron.com), but those are pretty damn far from viable as well. And also I'm biased because I want to control everything with my brain at all times.