Good arguments Noriad. This, however, begs the question, are we talking about the formation of cities or of just sedentary lifestyle. I can see how there's actually a difference and we are trying to see sed lif as being the cutoff when perhaps the sed lif they are pointing to in those references are more to do with our tribalism tech. I like to think of it as Ancient is coming from the founding dates of the oldest discovered cities.
That notion is incompatible with the current C2C tech tree. In the tech tree, farming comes right after sedentary lifestyle.
Large cities require a steady food supply. Which require established farming communities.
So the order is settle down (give up nomadic lifestyle) -> farming -> farming villages -> larger cities. As farming comes after sedentary lifestyle in the tech tree, sedentary lifestyle must equal sedentism, or the switch from a nomadic lifestyle to a stay-in-one-place lifestyle. As farming was invented over 10K BC, sedentary lifestyle must be before that and larger cities must be much later than that.
The youtube documentary called "stories from the stone age, first farmers" I mentioned before, also mentions that farming communities can have much larger families. Newborns can not walk for the first few years of their life so they have to be carried all the time. As hunter-gatherer groups are always on the move, this severely limits family size. Farming requires less travel and thus enables more rapid population growth which is necessary before starting a city.
I think the current tech tree fits history correctly and sedentary lifestyle = sedentism and happened 12,000 BC in the Middle East.
You list some earliest found sedentary communities and it seems like they are all extremely high land communities. Interesting.
That may be because the ocean has submerged all archeological evidence of coastal settlements. After the last ice age the ocean has risen by 120 meters, moving the coastlines significantly. The youtube documentary Flooded Kingdoms of the Ice Age mentions the discovery of 2 large underwater stone cities off the coast of India, each "the size of Manhattan". Artefacts recovered from there were carbon dated to 9500 years old (7500 BC).
The end-of-the-ice-age sea level rise came in pulses and the horrible world wide tsunami of 6100 BC probably killed untold numbers of people around the world, setting the development of humanity back by hundreds or even thousands of years, and is probably the basis of the countless flood myths from ancient times.