I think it's petty to think as such. Aaron Swartz has been a major topic of discussion on the HN Front Page for a couple of days now, hence it could very well have been instantly submitted to HN by some over-zealous HN reader as well. (Do remember that a sizable number of new users have joined since the initial news about Aaron's death.)
Just in this case, I'd suggest giving them the benefit of doubt.
I actually tried to submit it before "martinoma" but was told that I was submitting too often. It's hard to say if TC really did submit its own story - throwaway accounts are quite common nowadays.
Admittedly, I did decide to submit quickly so that I (might) reap the upvotes--HN has been transfixed by Aaron Swartz, and reasonably so, and I thought that people might like a reminder of how the community reacted a few months ago.
I wonder if it might not be better to not award karma for submissions which are upvoted. It's possible/probable that most stories of value would get submitted anyway, and it would discourage the mad rush to submit.