"Your organisation would adopt Scrum"

Scrum is not an organization framework - it is a team framework.

"The manager can't switch to servant-leadership"

Scrum doesn't understand servant leadership. See this article: https://www.linkedin.com/pulse/servant-leadership-its-what-scrum-says-cliff-berg/

Perhaps instead of "adopting Scrum", as the article says, it would be smarter to lean Agile ideas (not the same as Scrum), and think about how to better improve one's product delivery cycle.