It wasn't coined by NER0, it's always existed but nobody really uses it in a popular context.
Like I was using something similar in a different game about 6 years ago? The concept just wasn't really brought to CS until recently I guess, btrams was also using it for his clawback-bozo metrics.
I was aware of kill death differential (kpr-dpr) (coined by NER0 I assume)
I saw it in his latest article:
https://img-cdn.hltv.org/gallerypicture/Ftk-7pyLt3NPbL_w626koM.png?auto=compress&fm=avif&ixlib=java-2.1.0&q=75&w=800&s=07dcf82548dfcf5461d3ccfe8ac5dde3
I was unaware that it had such a strong correlation to Rating 2.1.
The leaderboard for kill death differential in the filters (LAN 2025 All >=52maps)
donk 0.29
ZywOo 0.27
sh1ro 0.24
m0NESY 0.23
ropz 0.17
And in general "baiters" and awpers are at the top of the leaderboard.
So this is another anomalous donk stat. (i mean he does have 0.95 kpr which is 0.1 ahead of the second place i.e. ZywOo with 0.85)
The closest non-awper/baiter is XANTARES with a kill death differential of 0.08 crazy.
It wasn't coined by NER0, it's always existed but nobody really uses it in a popular context.
Like I was using something similar in a different game about 6 years ago? The concept just wasn't really brought to CS until recently I guess, btrams was also using it for his clawback-bozo metrics.