There is much to criticize in how the BLM movement operates, but . I don't agree with all of it, but I seldom agree with all of any plan I see proposed from any side of the aisle.
In discussing the plan, Kevin Drum fails to address the elephant in the room for the Left in making progress on this, and that is the enormous reluctance of Democrats to challenge a public employee union. And you can bet that police unions will likely be the biggest barrier to getting a lot of this done, even perhaps ahead of Conservative law-and-order groups (you can see the token sop thrown to unions in point 10 of the plan, but it ain't going to be enough).
By the way, there is much that progressive and conservative groups could learn from each other. Conservative groups (outside of anti-abortion folks) are loath to pursue the public demonstration and disruption tactics that can sometimes be helpful in getting one's issues on the public agenda. The flip side is that public disruption seems to be all BLM knows how to do. It can't seem to get beyond disruption, including the unfathomable recent threat to disrupt an upcoming marathon in the Twin Cities. It could learn a lot from Conservative and libertarian groups like ALEC, that focus on creating model legislation and local success stories that can be copied in other places. Many of the steps in BLM's plan cry out of model legislation and successful pilots/examples.