My point is that human cities are "bolide sensors" and unevenly distributed in time and space, so the "measurements" are necessarily fewer than what occurs in nature.
Then there's bolides over desert, savanna, tundra, ice sheets, etc.
An air burst impact that’s large enough to take out a city won’t leave a major impact crater. And back in the day it might even be the case of the perceived cause contributing more to the decline of a city or even an empire than the physical damage.
If a meteor hit blows up your town when you have no ability to comprehend what just happened other than god/gods are angry you gonna move to a less cursed place.
It can also cause social impacts such as the toppling of a given religious or leadership class because they angered the gods.
And not even that guarantees a complete picture - what if a tsunami event erases or conceals the record of something like this? Volcanic activity? Desertification?
My point is that we can't reason about the rarity or uniqueness of these events as a main factor for accepting or refuting the hypothesis
https://en.wikipedia.org/wiki/Tell_Abu_Hureyra
It's a unique site of possible early long-term hunter-gatherer settlement right in the middle of one of the regions in which agriculture was first developed. It also happens to be one of the first agricultural sites! The pre-agricultural populations we're talking about are a few hundred people, which feels a little short of a city.
And it's one of the earliest examples of the transition from nomadic hunter gathers to more permanent settlements.
Nomadism doesn't preclude semi-permanent settlements, especially as migratory patterns retrace sites.
There is a theory by Jared Diamond [1] of how pre-Agricultural Jomon people of Japan were able to invent pottery 18K years ago: the wild-food rich environment of Japan, being moist, temperate, and surrounded by ocean - allowed them to have very settled lives while other hunter gatherers had to constantly move.
Outside of rate examples like this, there is little evidence that non agricultural societies reached even moderate populations.
Not disputing that, but my interpretation would be that there was just one airburst that covered both cities.
Abu Hereya (several hundred kilometers away, 9000 years earlier) was also discussed in the article, and is a separate impact.
"The geographical extent of the (Younger Drias) YD impact is limited by the range of sites available for study to date and is presumably much larger, because we have found consistent, supporting evidence over an increasingly wide area. The nature of the impactor remains unclear, although we suggest that the most likely hypothesis is that of multiple airbursts/impacts by a large comet or asteroid that fragmented in solar orbit, as is common for nearly all comets. The YD impact at 12.8 ka is coincidental with major environmental events, including abrupt cooling at the YD onset, major extinction of some end-Pleistocene megafauna, disappearance of Clovis cultural traditions, widespread biomass burning, and often, the deposition of dark, carbon-rich sediments (black mat). It is reasonable to hypothesize a relationship between these events and the YDB impact, although much work remains to understand the causal mechanisms."
Between Abu Hereya (10'800 BC) and Tall el-Hammam (1'650 BC) there was a 9'000 year gap.
Of course you’re going to get more cosmic events if you wait a longer time.
EDIT: The article discusses the potential impact at Tall el-Hammam in 1'650 BC, which also covered Jericho. A second impact at Abu Hereya in 10'800 BC is only mentioned, but not discussed in detail.