I don’t know much about Kirk or McGrath. I’ve read a few of McGrath’s blogs on Patheos. This doesn’t impress me any more than your OP. I’m sure there is an audience for this, but that audience is people who haven’t done much of any Bible study. If you do, and are still convinced that Jesus was God, or even that the NT clearly says Jesus was God, then either you wanted to think that in the first place and facts don’t matter to you, or, you’re just not a very good studier.