Interesting, and somewhat plausible. What gives me hesitation is that all the recent internet buzz surrounding the bits of evidence on this particular island trace back to this same source, which seems a bit self-serving. Not much corroboration from outside sources.
I hope they are right, it would be quite a find. But comparing the published images with others, like the recent one of a German Dornier on the bottom of the Channel, doesn't inspire much confidence.
-Glenn