It's the standard structured IR light over the scene. Which means that sunlight, reflected sunlight, florescent lights, or any other IR emitter will wreck havoc over the SLAM algo they have running.
What they need is a visual SLAM and not just the IR solution. It works well in their dark candle lit studio where they did the demos. But outside, near windows, near reflections from outside, and flood sources all kill or badly affect it.
Do you know if the structured light is made by the unit, or is it an unmentioned peripheral?
It's all driven by the unit, btw; no need for markers or external illumination.