Lens Length Effect on Depth of Field

Here’s a question that I can’t find the answer to online…

Why do people say, for example, that a 100mm lens provides better shallow DoF blur than say a 50mm? I am under the impression that shooting a subject with either lens so that the subject fills the same amount of frame would equal the same DoF (i.e. 50mm at 10’ = the same DoF as 100mm at 20’).  Is it just the compressed perspective of the 100mm lens that makes the blur seem greater?

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