You're saying it might be two coast-to-coast demos, or am I reading you wrong?
You're reading me wrong. What I'm suggesting is that in the "FSD won't be even demoed by Tesla until 2019." part PM_YOUR_NIPS_PAPERS does not actually talk of a video, right? He/she is talking of demoing FSD in general?
Some people on TMC earlier have correctly pointed out the coast-to-coast demo is not exactly an FSD demo, but just a demo of Tesla's self-driving progress, not really a demo of the "product FSD" (like the current Tesla.com video is not either).
Hard to say if PM_YOUR_NIPS_PAPERS was talking of the video there at all? Did you have the Reddit link/context?