I saw the video of the aide picking up something from the podium. My first thought was that it could have been some sort of tablet/Ipad—it didn’t really look like a bunch of papers. Could have been a notebook I guess.
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I may have been the originator of the "iPad prompter" theory -- but I based it on visual evidence:
I did a frame-by-frame analysis of that video clip -- and even created a little freeze-frame sequence of it -- as an analysis aid...
Observations:
It would be a trivial exercise to glue the pages of an ordinary (11" X 8.5") lined paper tablet together, cut a rectangular section out of the center, and mount a thin e-tablet (like an iPad Air -- 9.45 x 6.67 x 0.30 in) in the recess.
Retrieving it would simply involve keeping the cardboard tablet back toward observers -- and covering the iPad from prying eyes as you made your escape...
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CAVEAT: I have zero evidence that an iPad actually was serving as a prompter on Biden's podium.
But the circumstances do not preclude the possibility. And using encrypted Bluetooth or WiFi to communicate text to it would certainly be more robust and secure than feeding audio to an earpiece or audio implant...
YMMV...
TXnMA