I think you're underestimating how much we simply don't know about how to live that primitively. Maybe you could do it in small groups of people. Maybe up to a dozen. Most experiments at this fail hilariously early by the way.
Can you do it and sustain hundreds of people? I doubt it.
At least they're here to be potentially observed. You don't have to _totally_ wing it. People living like that through history had bigger day to day survival concerns than documenting the finer details of sustaining their continued existence to us.
The last closest analog we have to them would be the Hadza people and they've had agriculture since 500 CE...
But in no way is "their knowledge" (which I think is an overly generous use of that term) - acting in the role of a knowledge seed bank.