A person whose interpretative framework for the Mesoamerican Pre-Classic doesn't include the Book of Mormon will view it one way. A person whose framework does include the Book of Mormon will see it slightly differently, and will place significance and stress on certain things that the other person won't.
Professor Clark is entirely correct in saying that the current data certainly doesn't entail acceptance of the Book of Mormon. But he's also saying that the data are increasingly consistent with acceptance of the Book of Mormon, but that one won't be inclined to see that without some sort of commitment to the paradigm of the Book of Mormon.
You're just restating the same thing in a slightly different way. IE, "some sort of commitment" means "testimony". In other words, as he stated in his Q/A, one has to have a testimony to be able to see evidence for the Book of Mormon.
It's more than just being "aware" of the theory, which would allow one to pay attention to evidence for that particular theory. This is why he hasn't been able to convince any of his colleagues. He has made them aware of the Book of Mormon, they "read it like an archeology text", and are unconvinced. They remain unconvinced despite having the theory before them, paying attention to that particular theory, because they lack "a commitment" to the paradigm of the Book of Mormon - In other words, a testimony.
You seem to want to imply that the transcript I provided of the Q/A is incorrect, as you suspect they were "notes" written by Brent. You are incorrect on both counts. The transcript of the Q/A period is a real transcript, as in the words were transcribed by someone listening to the audio of the talk. It even notes the time stamp on the audio. It can be found here:
http://www.tungate.com/clark.htm
As far as I know, "mel tungate" is not code for "brent metcalfe".