Hmmm not totally. A bad actor could record the keyboard and then figure out a way to get it installed. Either through a logistics attack (not everyone maintains a secure supply chain), or an insider threat installing it. Everyone’s trained not to allow thumb drives and the like. But a 100% completely unaltered bog standard keyboard brought into a building is probably easier, and for sure less suspicious if you get caught.
Sure you might say, “but if you have an insider you’ve already lost” to which I say, your insider is at risk if they do certain things. But once this keyboard is installed, their own detection risk is less.
Now the question is, how far away can the mic be? Because that’s gonna be suspicious AF getting that installed. BUT!!! this is still a great way to break the air gap.
good point about the room.
as for an installed keylogger, there are organizations that will inspect for that and catch it. My point is this is a way to get an actually unmolested USB device into play.
But I hear you, this isn’t likely an ideal option right now, but it is an option for maybe some niche case. And these are early days, put enough funding behind it and it might become more viable. Or not. Mostly I’m just offering the thought that there ARE use cases if someone puts even a moment’s creative thought into trade craft and the problems it might solve like breaking the air gap, emplacement, avoiding detection, and data exfil. Each of those are problems to be solved at various levels of difficulty depending on the exact target.