The nature of the flow of the Humber may well have resulted in changes to the shape and size of the island; a comparison between contemporary and modern maps may well show any differences. (Many years ago the Humber Conservancy Board ran a physical, scale model of the estuary in Hull to research the tidal effects, and I spent far too much time watching the forces of nature destroying stuff)

While I’ve no reason to doubt the explosive effects of the V1 payload, impacting into soft, intertidal mud may have had a moderating effect.

You never know, it may still be down there. 😮