Davey Wreden

Davey Wreden, in real life, is the creator and designer of The Beginner's Guide and The Stanley Parable. Davey Wreden is also brothers with famous content creator Doug Doug. Within The Beginner's Guide, he is the narrator and as such, one of the main characters. Most interpretations of the story in The Beginner's Guide make a point of differentiating between real-life Davey and narrator Davey (fictional), as most assume that the game's story is not factual, even though Davey is voice-acting himself as the game's narrator.

Davey in The Beginner's Guide
Throughout the game, Davey shows himself to be an unreliable narrator. From the beginning, he is already imposing his own interpretation of Coda's maps onto the player, and making substantial changes to his levels as early as in Whisper. That trend culminates in the last map made by Coda, Tower - where it becomes clear he is not only making the changes he is telling us about, but also other changes he is not being as forthcoming with, clashing with his apparent transparency thus far and shows him not only to be unreliable but also, more than that, untrustworthy- or even manipulative (and malicious).

In this sense, it is hard to assume that anything in the game is factual, or that Coda's maps weren't largely modified as a whole (or even entirely replaced) - but to some extent most players choose to assume Davey is being truthful to a large degree, as the other option is assuming Davey is lying about everything (and just discard the entire experience). However, it is still wise to take everything Davey says with a grain of salt - including the idea that this game tells a true story about true people in the real world, as stated in Intro - or, by extension, that Davey, the narrator, is the real Davey Wreden and not a fictional character assuming the role of Davey Wreden for narrative purposes.

According to Coda's letter, at the end of Tower, Davey was the one who added the lampposts to his games; and according to his own dialogue in that same level, he also modified the House game to put an end to it, as the chores would normally "go on forever" and '[the player] would just clean a house" (note however that if you play the game with narration turned off, which is supposed to play the levels "as intended", the chores will still be interrupted).