I've been at a bunch of companies with a bunch of raises. 100% of the time, the announcement was an excuse for press. If you can come up with any excuse to get an article published in a bunch of tech press (other than "CEO arrested for embezzlement + harassment at the same time"), you get a bunch of free advertising. Bonus points if your target customer tends to read tech press.
There's nothing wrong with that, to be clear! I'm just surprised they acknowledged mercenary reasons without mentioning what I've seen as the most common one.