Actually, if you listen to Hart carefully, he appears to believe the prologue was written by a different author than the gospel and that they had different Christologies. Hart does ascribe a subordinationist view to the prologue and argues for a full ascription of divinity to Jesus at John 20.28. The contrast he provides between the two should be an additional clue, as if it is needed, that he views the prologue as containing a subordinationist view compared with 20.28. But he is not definite even on that point because he allows for the possibility that the title is used honorifically of Jesus in the verse, or that Thomas is praising God not Jesus in the verse. You don’t have to agree with that, and neither do I, but it’s what Hart says he thinks about the subject. So stop trying to ventriloquise him to support your theology.
Hart explicitly rejects the interpretation that this means the Logos is a subordinate or lesser being
What part of “there is not co-equality” do you not understand?
He rejects the idea that the Logos is “God most high” in the sense of being the Father but affirms the Logos’ full divinity
I guess you can play fast and loose with words like this because you are so practised doing it in scripture itself. When Hart says that the Logos is not “God most high” he means just what he says. He doesn’t require you to redefine the terms for him to bend it toward Nicene orthodoxy. Otherwise who knows what anyone means by anything. Perhaps by “the Trinity doctrine is true” what you really mean is the Trinity is false. It’s ridiculous.
Hart’s whole point is that John 1.1 has a different view of the Logos than later Nicene orthodoxy, that the Logos is subordinate to the most high God in this conceptual world, and that this view of the Logos persisted until at least the fourth century. He says these facts may surprise some but they are well know to scholars. What you are doing is isolating individuals words and phrases to turn everything he said on the subject on its head. (Such as he wouldn’t translate theos as “divine”.) Other times you just make it up entirely, such as your claim that Hart merely acknowledges “diversity” rather than describing the Arian view as an extreme version of traditional orthodoxy. No doubt Hart is aware of “diversity” in early Christianity, but where are you quoting this, and how does it negate what he says about Arius holding the traditional view and Nicaea representing novelty?