This release was made possible by major work of mark_fullmer.
He wrote (adjusted to make sense here):
This release is a complete rewrite of the existing alpha code, with the main goal of having all of the redirect import logic in a D8 service, to make writing tests easier and for separation of concerns.
Includes some bugfixes related to error messages displayed to the user.
New feature: Export redirects in Path redirect import format.
MInor code refactor.