Breaking the fourth wall is a Doctor Who tradition - the First, Fourth, Sixth, Seventh, Eleventh, and Twelfth Doctors all directly address the camera in addition to the Fifteenth, as do River Song, Martha, Clara, and various Classic villains. I don’t understand why people suddenly need some sort of in-universe explanation for it. It’s a narrative technique, and Doctor Who is a goofy camp show that’s always been flexible enough, playing with various tropes, that it works. Davies explains it perfectly in the link: “I mean, you would [be taken out of the story by it] if it was Pride and Prejudice, that would be odd. But there’s something showy about Doctor Who, there’s something proscenium arch about it. There’s something arch about it, full stop.”

This sort of needing an in-universe explanation for every theatrical device or inconsistency is how you get garbage like Trek’s Klingon augment virus.