[doctorpangloss]

Or, biceps and support for redistribution are both correlated to something else, the far more likely and simpler explanation.

[glomph]

They didn't claim causation.

[criley]

How is an intermediate correlating effect far more simple than not having one?

[analog]

Bicep size is probably far more closely related to high body fat rather than strength. It's much easier to put on fat than muscle.