I haven't checked every node that was removed, but in general I agree with @Ponderosopine here - @bdiscoe, you should not recklessly use the Simplify tool to reduce the detail of someone else's contributions. There's an argument to be made for using a value of 0.01 m to remove truly redundant nodes, or using the tool on imports with "fake" accuracy / interpolation geometry, but 0.3 m is definitely high enough to be destructive of accurate contributions.