The first time around I didn't realize it was Thrawn who was dealing the massive damage (11k per Fracture hit so 44k total) and so I lost miserably. Second time, if you keep Thrawn stunned, neuter Palp and Vader where you can and use Luke to keep taunt off of the STs then you're perfectly fine. The OP is right in that it does show that, and my alt enjoyed those rewards, definitely in need of those shards. However, as @locodiel said, this event is newer and unique, in that it only THIS event that has done this and shows that it's possible. And of course it is possible, they programmed it to be so.
I honestly do not think there's an argument here because there's nothing to prove (in this instance). Of course anyone can beat it if they think, that was the point of the event. They wouldn't release it otherwise (although, knowing CG.... ;)