Comment by rgmerk

  > If the redaction is a person's name

I'm not sure if you're aware, but peoples names are variable in length. We are talking about a system that can identify single character differences. So that does reduce the search space, especially since names are not all possible letter permutations. Combine that with the fact that it isn't uncommon to see partial first letters show up. You can even see some instances in the Epstein files.

Of course, you can also take this further. Even if you can't recover names you can get meta information about how many parties are involved by recognizing different length redactions correspond to different entities. While same length redaction doesn't guarantee same entity it is a hint.