That term was a complete neologism when the terrorist started using it, and I find it very unlikely that someone on would have come up with the term independently.
However, it's definitely only really taken off after 2011. So you're correct that there is an obvious connection. And I also know it's definitely a dog-whistle term. Sargon / Carl loves it too.
That term was a complete neologism when the terrorist started using it, and I find it very unlikely that someone on would have come up with the term independently.