Many publications mention "autumn treatment" for varroa - even Beebase. However "The Apiarist" blog gives a good explanation why the terminology is wrong and it should be late summer treatment. Treating in autumn is simply too late for the colony to be in the best shape possible as winter bees are already in the hive before an autumn treatment.
https://theapiarist.org/when-to-treat/
https://theapiarist.org/when-to-treat/
May your bees read the same books as you do.