It stinks.  It is pay-off to all the build-up of Flux in the weakest way possible.  Once again Chibnall ends a big story by vomiting out some exposition and farting out a conclusion to the conflict in the most hand-wavy means possible.  Flux as a whole is a colossal failure.  A catastrophe of undelivered potential.  Is half the universe gone?  Have our characters changed or really been challenged at all?  It will take another show-runner to answer that and even show a hint of the Doctor grieving.  I like looking back on this now a bit more since the franchise has moved on a bit.  Flux is not much more than a bad memory now and I prefer it that way.