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Isn't any radio transmission decoder capable of doing that? As long as it has some level of density limit for crossing obstacles.
I would suppose that bandwidth, material absorption and environmental noise would be the most important factors here. Doing it with WiFi is 'novel' and gives them great publicity, it's technically impressive if they're able to meet the posited scenarios for use, but it felt like they were exaggerating or being taken out of context. But hey, even light is just waves really.