Unfortunately, because the information transmitted is a single bit, I'm concerned that there are all kinds of ways this sort of system could amount to "are they using this very, very general part of their brain or not?" transmission. On the receivers side the decoding could be accomplished not by "feeling the thoughts" in the sense we would expect (i.e. the thoughts of another person inside your head), but rather by having that single bit of information felt by the electric stimulation of the skin of the scalp, etc.
Granted, they do say they introduced noise into the signal -- but again, if the information is just one bit, and you're aware of exactly the information's timing, etc, it makes decoding it a lot easier. (No "When does the signal start?" problem)
I am long-term BCI/CBI Bullish, but I'm concerned this is less of a "new age" moment, and more of a "clever headline" moment
I'm most excited that this was done with only an 8-channel OpenBCI headset, 16-bit, for the "Receiver". The "Senders" had a much stronger/better headset, but seeing open hardware show up in this is awesomely inspiring!