Yes, it probably is just a coincidence that Steve Jobs' illness recurs just when Apple profits are this high.
But on a more fine grained timescale a few days more or less in the timing of the announcements might make quite a difference in how people perceive this. If they had announced a month ago instead of right next to record quarterly earnings it might have hurt the stock more at the time than it does today.
The market is in theory 'efficient', but in the short term it tends to overreact to bad news, so combining bad news with extremely good news may be a viable method to offset the effect of the bad news on the stock.
Savvy investors will have priced Steve Jobs health in to their stock holdings already, those that are on edge might panic and sell unless there was a second factor.