My DNA test says I am from the Levant.

[Celerity]

71. massive (profoundly so) overcounting of how many total humans have existed over the past 2500 years + completely wrong

maths

you said

That’s 100 generations or 2 to the hundredth power.

100 generations of humans from 2500 BCE to the present day does not produce 2 to the 100th power (roughly 1.268 nonillion) humans who have existed in that time period, nor ever existed, going back to hominid times millions of years ago

that claim is off by orders of magnitude

I would say the total number of humans and homnids who have existed since 4 million years ago is likely below 160 billion max, and almost certainly well, well below 200 billion max

2 to 20 billion total between 4 million BCE and 200,000 BCE (and, my words, lets double that 20 billion to 40 billion to give every benefit of the doubt)

Hominid population estimates

https://en.wikipedia.org/wiki/Prehistoric_demography

It is estimated by J. Lawrence Angel that the average life span of hominids on the African savanna between 4,000,000 and 200,000 years ago was 20 years. This means that the population would be completely renewed about five times per century, assuming that infant mortality has already been accounted for. It is further estimated that the population of hominids in Africa fluctuated between 10,000 and 100,000 individuals, thus averaging about 50,000 individuals. Multiplying 40,000 centuries by 50,000 to 500,000 individuals per century yields a total of 2 billion to 20 billion hominids that lived during that approximately 4,000,000-year time span.

and, roughly, around 120 billion since then:

https://www.visualcapitalist.com/cp/how-many-humans-have-ever-lived/

Quantifying Our Ancestors

snip

Quantifying all of humanity requires a firm starting date for when humans became, well, human. Evolution is a gradual process, so figuring out the start date for humankind is no easy task. For the purposes of this exercise, however, the two demographers used 190,000 BCE as the cutoff.

There are two opposing points to consider when thinking about prehistoric humans:

Around the chosen start date, the global cohort of humans was quite small—perhaps as low as only 30,000 individuals.
Before the modern era, lifespans were much shorter, so long stretches of time can actually influence numbers drastically.

With this context and timeframe in mind, the demographers estimate that 109 billion people have lived and died over the course of 192,000 years. If we add the number of people alive today, we get 117 billion humans that have ever lived.