Season reviews tend to be fairly large in scope. Each department have their own review of how the season has gone, what challenges they have faced and what prioritisations and changes they need to do for next season - usually with data provided from analytics that also has to produce that data in a way that is easy to understand. The heads of all of the departments then meet to discuss how each of the departments have done, and review how the club as a whole has done with their targets, what they want to achieve next and what each department finds important. Each department have their own meetings, then the department heads have meetings to coalesce everything and try to see the larger picture. THEN it goes to the decision makers. It takes time.
The goal is to figure out what you did well, what you can do better, how you need to prepare for next season and what you need long term, so that decision makers can adjust budgets and implement changes. Often issues can overlap and serious problems in one department might be down to issues in a different department, or be down to how information is shared between them.
Injuries for instance can be down to coaching, poor visualisation of data, an inefficient reporting structure, leadership issues, staff issues, external disruptions, poor facilities, poor data gathering, poor cooperation between departments, individual errors, issues with nutrition, issues with recovery routines, issues with load management, bad sports science, over cautious practice, over-zealous practice, lack of squad depth, poor follow up of players - and more.
Most of that work will have been done already, but it is still a sizeable job to coalesce everything you have learned into an understandable and actionable plan. As I understood it from Ten Hag - the coaching staff and the First team had their meetings before the cup final.
TLDR: To answer your question; I assume they will be taking the information from all of the different departments through meetings with the various department heads (which they did with the first team last week), before finally bringing it to a series of meetings between Brailsford (standing in for Ashworth), Wilcox, Bell and Blanc (standing in for Berrada) to assess the strategy going forward. One of the elements of that list will be the managers position. I reckon they spend 3 days on those meetings alone.