There is no longer a requirement for a 1 hour revalidation flight. The Regulation now says refresher training of at least 1 hour of total flight time with a flight instructor (FI) or a class rating instructor (CRI).
It can be any number of instructors on any number of flights and does not have to be conducted at an ATO or DTO. The instructor must sign the log book to verify the flight(s) An instructor who has FCL.945 entered in their log book may sign the revalidation provided that they conducted the last of the revalidation flights and you meet the experience requirement.