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Correct me if I'm wrong here but wouldn't tech like this also sap signal strength like nothing else?

This seems like it would be a potentially nice to have first layer in a secured room/building. Recoup some energy then actually go about blocking unwanted signal leakage.

From a wild speculation side: if a tour bus of the elderly with pacemakers powered by this goes by are they just a traveling dead zone?

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If this device is blocking line-of-sight between you and the WiFi access point, then yes it will reduce your signal strength. In this respect it is like a fish tank or any other object that tends to absorb WiFi frequencies.

It cant suck the WiFi out of a large area like some kind of vacuum cleaner, Electromagnetic waves don't work like that.

Can't you just do this with tinfoil?

You can make a Faraday cage out of a lot of stuff but I doubt you could get much in the way of power out of it. Granted you can't get much out of this either but it's measurable.

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