Actually its not that far from reality. This statement says "neutralized", not killed. Sohr says 219 is killed, SCWM says 345, Aleppo24 says 405. "Martry" pics people has gathered from ypg affliated twitter accounts goes beyond 400. General estimate is somewhere around 219 and 400s. None include wounded and captured. Wounded is usually x3-4 of the killed. Even if you take 219 as the base, the total number of killed, wounded and captured still easily goes beyond 1000.
But surely nobody can deny that TAF gives a rough estimate, especially for air strikes.
Most logical assumption is, he's trying to lure us into a trap, when we kill his men, he will probably force Russia to change its stance and try to force a no fly zone.