That gemara also says that the bas kol says, Sadeh ploni lploni, so and so will buy so and so’s field. It really doesn’t seem to be saying that there is a magical person. Only that Hashem knows the future. Anytime we do anything, or make any decision, Hashem knows in advance what we will do.
I know this is confusing, but it seems to mean that one can’t pass up on his bashert. However, the Steipler was rumored to have said that if a person is too picky, he can miss out on his bashert.