Ron, I note that you added the words, "but not limited to," in your post. Those words are not in the letter. And even though "including" means "including but not limited to," lawyers don't always use it that way and courts don't always read it that way, such that many (most?) lawyers, when they mean including but not limited to say "including, but not limited to," even though they know its redundant. Now, only the attorney writing the Harrington letter knows for sure if he intended "full" as in "not a pro rata share," or full as in "comprehensive," but I doubt it's a coincidence that when the FAA talks about direct costs of a flight they usually talk about fuel and oil and he specifically called out those costs.
Even you would have to draw this line somewhere. Do the "full costs" for ferrying the aircraft include amortized shares of the annual (for how many years?); tie-down; light bulbs; tires (what if I'm especially heavy on the brakes?); depreciation; windshield-cleaning products; home-airport line-boy Christmas tips; etc.?
We can have a philosophical discussion about legality, criminality, legal drafting, and doctrines of interpretation if you like. I'm totally down for that. But in the context of real world, practical advice where nothing is risk free (especially in flying), I'm pretty comfortable saying that the situation described by the OP is OK.