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Quite simply, there are so many stories, it's impossible to know what (or who) to believe, and, as an added nuisance, we're up to our armpits in naysayers (some quite vicious in what they're saying,) who're desperate for there to be nothing.
I can't understand it, since they'll get maybe a couple of days, crowing "I told you so," then nothing, while, if there are viable airframes there, thousands will be able to enjoy them, for years to come.
Digging is supposed to start mid-January (ish,) which is about 6-7 weeks, so is it really that hard to wait that long?
Actually there was steel and possibly magnesium used the construction of the Spitfire airframe.