The links discuss FTL communication implying communicating through time. I haven't taken the time to fully understand the arguments, so for the sake of this discussion I'm willing to simply assume that their conclusions are correct.

Now... Please explain to me how communicating through time will allow you to literally, physically, shake your own hand as was claimed.

It's the same argument, just instead of assuming one can send information FTL, one can send matter. Or you assume a teleporter exists.