Its like a scenario you might come up with if you went to a geologist and said "Pretend you found the PERFECT site capturing evidence of the impact that killed the dinosaurs, write up what it would look like and don't worry about how implausibly unlikely it all is"

But that appears to be exactly what was found... if I remember correctly the initial claims were treated skeptically, in part because it IS so improbable, but also because the guy making the claim had a controversial history in the geology community? Or am I misremembering?

Whatever his reputation was, I am pretty sure discoveries like this set you up in the field for life....