Problem is, it's actually an ideal site for many reasons. There are very good motorway and rail links, it's ideally placed for any traffic heading to the continent or Eastern Europe, the Isle of Grain is very flat and relatively sparsely populated (OK, three villages would go).
Downsides - a large bird population, so birsdtrike / conservationist problems. One GA strip will be squashed (Stoke). The existing GA corridor to Kent and Essex will be further constricted.
You may be right, but I think this should be taken seriously.
What I can't understand is why (a) the government insists on allowing everything (industry, population, transport) to be concentrated in the SE, and (b) why none of the many military or factory airfields closed down over the last 20 years can't be re-used.
G