it was this novel -> First Contact (novelette) - Wikipedia

but slihtly changed version for radio. even story were different.  but start of story were same i think. I had not read this novel. but radio show were about this.

hey this coincidence means -> 

hey I had studied learnt some more basics of category theory last year from Tom Leinster's book.

I studied category theory to develop ml algos (later  to have develop warp as such scope we added to scope. )

then possibly aliens means we would meet in future with them when we have warp capable space crafts. in such Nebula regions. 

it means aliens can iterate people to specific multiverse versions to communicate. 

so they are ahead of us interms of humanity's multiverse technology. they have multiverse technologies already and can communicate with changing a person;s multiverse versions. I mean iterating person to specific multiverse universe configurations alike. 

this is my interpretation to this coincidence.

since because before the grasshopper coincidence happent then this, I believe aliens are interacting with my universe. (as a possible interaction to inform humanity of the multiverse nature of the universe) of to have since we had defined the sheaves theory of multiverse and lenzy thingy interaction of it, I think with aliens making coincidence to Tom Leinster's book  (which i learnt sheaves concept from there) I think aliens mean "hey humans, go on you are on correct path of inventing multiverse warp tech! " 

wooooooooooooov turns out this very talented  sci fi writer were also writing about multiverse :) woooooooooooooooooooooooooooov