I'd wager the only reason they phrased the headline that way is because "speaking about yourself" implies speaking to others, and if they were to clarify by say

I'd wager the only reason they phrased the headline that way is because "speaking about yourself" implies speaking to others, and if they were to clarify by saying "speaking about yourself, to yourself," that seems wordy and redundant, so the best solution ended up being just "speaking to yourself."