I think that's just a fun title. I searched for London, UK when it was set for 750 million years ago and it said something about the land not being there for it yet. As advised, I changed to a more 'recent' year and it came up.
My home in the middle of the US existed 750 million years ago on land, but then broke off as a small island and sunk. I had to wait 350 million years before it re-emerged from the ocean.
I think that's just a fun title. I searched for London, UK when it was set for 750 million years ago and it said something about the land not being there for it yet. As advised, I changed to a more 'recent' year and it came up.