10% of the force is not a small number but it’s also not a decimation.
"n the military of ancient Rome, decimation (from Latin decimatio 'removal of a tenth'[1]) was a form of military discipline in which every tenth man in a group was executed by members of his cohort." [0]
So, a 10% cut fits the definition.
The immediately self-contradictory passive aggression is pointless.
> I never heard of 99% as the definition of decimated.
Most people hear decimated and think "totally gone" or "almost totally gone".
Not totally gone or almost gone, merely "severely" or in "large numbers".