Your AI post is utterly bizarre if read carefully Aqabot. You start out by saying that Brown does not “vindicate” the NWT rendering. Then you go on to acknowledge that Brown says the NWT rendering “with the blood of His Own [Son]” fits Paul’s theology and “perhaps Luke intended it.” If not a full throated endorsement, that sounds like a measure of support for the plausibility of the NWT at least. It at least undermines any argument that Acts 20:28 is a reliable endorsement of 4th century Nicene Christology.
The doubt he registers is not about the text (“church of God” is accepted) but about how the genitive τοῦ ἰδίου should be construed.
Actually, he explores and expresses doubt about both. This is a false summary. Simply factually wrong.
As so often with these fabricated AI posts, the conclusions offered either don’t match the evidence presented, or else the evidence presented is a fabrication. It takes a lot of time and careful reading to work out exactly where the problem lies and that is why it is a waste of time.