Perhaps dear Kolokotronis was making the (IMO correct) point that God isn’t a person, but God the Father is (like God the Son and God the Holy Spirit are too). IOW, to correctly convey the Triune concept of God, it’s best to not refer to “God” as a person, but only refer to a person of the Trinity when speaking of such. In the context of the text in dispute, it seems the author was speaking of God the Son, so in that sense he (the author) was right, but in a technical sense it can be said that the author should have been more clear. (i.e. saying “Objectively, the core of faith is God the Son, who is a Person, not a concept.”)
Maybe?
We ALL know that God is not a person. Hence, the clarification posted from the CCC.
They say that language is the worst form of communication because it fails to properly express what is in our hearts. This discussion is a good example.