I don’t know if you can factually back up your claims but I applaud your proper use of decimate. It is a rare thing. One might even say it happens less than 10% of the time.
If you threatened me with death if I didn't cut off my feet, I wouldn't consider that "reduction by 10%" even if mathematically it might be.
That said, I had sweet breads recently. And a cat being a deer sounds strange in English now, but deer is still the word for animal in other Germanic languages today, even if it faded in English, so it doesn’t sound completely archaic.