The SpaceX boosters don't re-enter from orbit; they fall off on the way up. I looked long and hard at the screen shots of the ship and the models, and I can't see anything that looks like landing gear or legs on the Phoenix (SpaceX has four legs). I wouldn't advise landing it directly on the nozzle, either. Most likely, the nose piece separated, glided thru the atmosphere a la lifting body (note heat tiles on bottom of capsule, windows on top) to bleed off speed and fly to the landing site, and deployed a parachute for final descent near the launch complex since the guys where there for the party. The warp drive section was still in orbit. Either way, I believe it survived because of this line of dialog: PICARD: It's a boyhood fantasy, Data. I must have seen this ship hundreds of times in the Smithsonian, but I was never able to touch it. If Cochrane reused it, it must have durable to survive all its trials.