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I agree that this is the most puzzling set of words ever strung together! I think that the author may mean he can share [this information] with the reader this night that because her parents had "spilled the beans to everyone (die Welt/the world)" (about "something" not specified), and how much work it took to bring the amazing piece of work to fruition.
Without more of the letter, it isn't possible to speculate further. I wonder if the person was not a native German though.
All the best,