I understand the story is one sided, but if I take it as truth, the immediate red flag is how the manager failed to manage. In the first examples gave me all the things I would have needed to know to bail on that team.

When technical decisions come up with no obvious correct answer, the manager saying it's up to the team while also disagreeing is just bad. The team provides input and offers their view on best direction but it's up to the manager and product manager to be technical enough to understand the team and then balance business needs (which may be unknowns to the team) and make a final decision. The team then should accept it.

The push back of using a parallel kanban board is just dumb on the managers part too. Management and teams often need different tracking and reporting styles to get work done. Your direct manager should be familiar with both. If they are not or refuse to be, just run.

Managers enable teams by empowering, deciding and then getting out of the way. Bully managers use passive aggressive non-sense like you had to deal with.

For Spotify to not recognize and isolate this person is a problem all the way up there chain.... And again, assuming your version is correct.