I honestly don't think it is that at all. I don't think he is toeing any lines. I don't even think he is 'trying' to stay impartial.
I just think he has a professional opinion, based on his reading and experience, and he gives it. He gives it honestly and without pretence. He seems invested in his field, and I don't think there's anything worth him compromising that principle, not even footballing allegiance. I don't know, but I wouldn't be surprised if he also had a professional code of conduct that covered stating things with honesty and integrity or something along those lines.
I am in complete disagreement with his main takeaway of this. Not the wider details he discussed, just the main summation of who won what, and why it would even matter through what 'lens' that is viewed.
But I don't question his reasons, reasoning or intention. Just his (in this case) opinion.
At least based on how I read what I have read. Which is not the full 175 page document, just to be clear, but the two statements, and the summary page verdict.