Jurassic Pratt
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By RAW it isn't because it doesn't say that it is mind affecting. Additionally, undead will be immune to the shaken part of it as shaken is fear related and thus undead are immune.
However, it'd be pretty reasonable for a GM to rule it mind affecting as the flavor text makes absolutely no sense for creatures immune to mind affecting things.
So basically, RAW yes it affects undead but the shaken effect won't work. But RAI it probably shouldn't work.