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(I admit it's an annoyingly redundant word, but I can accept it from a non-native speaker.)

It’s posdible that the poster is Swedish, where the direct translation of “overexaggeration” is “överreaktion”

Over-reaction would be the direct translation. Over-exaggeration would translate back to Swedish as överöverreaktion.

Are you saying there's no appropriate level of exaggeration to exceed?

There is no possible level of exaggeration which could ever be enough.