Sorry, no real evidence. You can find similar coincidences for almost any date. Just a quick look at July the 4th for the US turned up the following.
July 4.
Declaration of Independence.
John Adams Dies.
Thomas Jefferson Dies.
Pathfinder lands on Mars.
Richard Petty wins 200th .
Vicksburg surrenders.
Leaves of Grass published.
CIA informed of Vietnam Coup Plot.
It may well be an interesting book to some but it is certainly not corroboration of anything.
Thanks for posting it though. Too bad there is nothing there.
Aslan is not a Tame Lion