I can see discrepancy here at one place we are taking about leaderless replication and multi master as separate ideas and here we have merged leader less into multi master replication please refer below:
Thank you for reaching out to the Educative Team.
There is a lack of a standard nomenclature in the area of distributed systems. Different authors often refer to the same idea or technique with a different name. The two courses that you refer to are written by different experts, who took a different naming approach. Having said that, indeed, leaderless replication in one course is fundamentally the same as multi-master replication in the other. Furthermore, you might notice that the Multi-leader replication in the Introduction to Distributed System for Dummies, doesn’t have a counterpart in the other course. This is a hybrid scheme that the other author did not feel the need to cover.
I hope it helps.