Another explanation:
It's a special point, if you apply endomorphism for it, you will get previous point (Point - G).
It's funny to have two points
next to each other with same Y, isn't it?

And since you know the
distance between these two points, you can calculate the private key easily.
It was all about the wording, you made it sound as if there are two points
next to each other. They are actually
private keys next to each other. And the same goes for the distance - it is the distance between the private keys. Anyway, there are at least four keys that have the property which is the basis of your puzzle (same Y, adjacent keys), not just a single one. A better question would be: shouldn't there actually be 6 of them? What happened to lambda^3 = 1? Hmm.
LE - I think there are maaaany more other solutions. For example:
(k/2)*lam = (k/2) + 1
k = 26024669624720066173548254508404295800636635574530772464662847532876721171439
kG.y = (k+1)G.y =
0x99dabfaa9e4dac1be74714258a4f862f2694e9d6e6b74f9fe979a7ebeec465fc