“Someone needs to check the definition of decimate.”
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3a : to reduce drastically especially in number cholera decimated the population.
b : to cause great destruction or harm to.
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https://www.merriam-webster.com/dictionary/decimate
Definition of decimate transitive verb
1 : to select by lot and kill every tenth man of a regiment
2 : to exact a tax of 10 percent from poor as a decimated Cavalier
Not the 90% mentioned