Those pirates were players yes, but the idea of that is not that far. We have to think one thing, the idea is not to troll(it may end up being that for some people) but a player that kill you in that ship has a free ship(your ship) to sell somewhere(and if they just capture you, a slave to sell), a group of players, and even a well done AI can try to do something like that.I watched the GC demo, and I have to say, it looks amazing. I love the idea of EVA'ing over to a derelict ship and seeing the assorted post-battle detritus floating around.
But I realised that most of the online gamplay wont be like that. For a start, I suspect the "AI" on the destroyed Starfarer were players, as the "pirates" on the planet. I doubt players are going to be sitting around in empty ships, waiting to troll someone who may or may no come along.
If they end up doing it in the final 3.0 is yet to be seen ofc, but it is possible. At least for players.