Old thread merged with the BO and Orion thread. This is the new one.
Useful links:
r/SpaceX Wiki
Long list of acronyms
People say that (incorrectly) about sustainable fusion power, sure, but this is about an unsustainable pulsed Z-Pinch fusion propulsion. That's a much easier problem. If we had the political will to build it, we could do it without any major issues or new physics.