I dunno, if Colin Furze did this with that kind of title, I suspect he wouldn't have aaaany trouble getting that much exposure without stretching the truth.

I had that thought as well, but TBH I don't know much about physics.

At 4000 degrees Fahrenheit, would the flame's fuel gasses technically be a plasma?

And if so, then what's the detail that made both of us think that what they built doesn't match our expectations? Maybe we assumed they'd say "flame" for this design, and only say "plasma" if it was a cold plasma?

If the gas is hot enough to be seen, its generally a plasma. Basically all fire is plasma.

This is absolutely false. Fire is NOT plasma. Also, CO2 doesn't start to dissociate until around 4000 F. Which means basically all the electrons are still bound to elements and the chemical bonds and not free as to a plasma.