I'm wondering the same. But I don't think they would released something this big and not find a way to make it work in the dark. It would be pointless.
It doesn't use the existing light in the room to transmit data, it sends it own light pulses and the same way wifi sends it own microwave pulses. The light itself is extraordinarily dim relative to what humans can detect, and can also broadcast slightly outside the human-visible spectrum, so it creating unwanted light pollution also isn't a problem.
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it works in the visible, infrared and ultraviolet light spectrum, the last two we can not see. so if you have Li-Fi that uses infrared and ultraviolet light on, the room can still be dark.
It's an idea. It would mean though that devices need their own light emitting capabilities. The article wasn't clear about how devices sent data back and forth.
I suppose it's useful if it can be made. But those speeds don't benefit home use. That's government/tech business level throughput.
I'm from Venezuela, and especially where I live it's super slow.