My "scrum leader" (who we handled agile just fine without before) is constantly complaining about points or priorities shifting, to the point that he'll tell us to not put what we're actually working on on the board because it'll mess up the burndown chart.

One of the 4 values of agile is "responding to change over following a plan". He's parroted this to us before, and yet still doesn't seem to see the irony.