But the entire thing is framed as Kratos having changed for the better. After he kills Baldur, Freya rants that he sucks and can't change, to which Kratos holds his head high and says that means she doesn't know him at all, which then Freya puts to the test by reminding him how he keeps his past secret, to which Kratos then finally opens up and tells him his past, showing that he indeed has changed from how secretive he was at the start of the game.I'd say a big part of the game is portraying Kratos as a very flawed teacher. Not every lesson he tries to teach the boy is a good or healthy one. I don't think it's patting him on the back either as it is portraying him as trying to make a good choice in a fucked up situation but Kratos through out the game has hardly been making the best decisions or judgments through out.
The entire thing is framed as Kratos being right about what he did in that moment. It doesn't feel ambiguous at all and it's clearly signalling that Freya is wrong and just deranged by grief.