I'm sorry, this is simply incorrect, and blatantly so. The evidence I presented is the following.
Since the Zygon two parter (ie: the timeframe in which we know he was shopping this), there were only two types of novelizations, Target novelisations and Doctor Who photo novelisations. The subject matter, tone, and indeed, literacy level, are wholly inappropriate for it to be of the second type. Thus if we are to seriously consider it to be considered for a novelization it must have been the first.
However, Target, to my knowledge, has never made an unfinished story into a novelization. Not even Shada. Please correct me if I'm wrong. Similarly, they've only lightly touched NuWho, going for stories that were well received in the context of the season they were in. So for Harness to think that he had even the slightest chance of getting this published given these facts is absurd.
And since I don't believe Harness is incompetent. (Please stop accusing me of saying otherwise) I'm forced to conclude that this is a framing device.