Indeed, and "If you will be perfect, go and sell that you have, and give to the poor, and you shall have treasure in heaven: and come and follow Me" was something that Jesus supposedly said. Does this also sound like the beginning of socialism to you? Is any statement opposing unbridled greed "the beginning of socialism" to you? Most people have a slightly less superficial understanding of socialism, so that might explain why they aren't as quick as you to label everything "socialism". The same applies to your Rousseau quote.
No it does not, it sounds like you are free to choose to sell your possessions and give them to the poor. Socialism doe not allow for a choice it's give up your wealth by force or threat of force. Rousseau's quote was saying that no person had a right to private property and that all property belongs to the collective. "the fruits of the earth belong to us all, and the earth itself to nobody.". I don't have a subscription to Modern Socialists but I'm pretty sure the means of production being controlled by the government is a pillar of socialism.
Gravity the concept as we understand it today, or gravity the force? One indeed did not exist before Newton's definition, while the other did.
Let me put it this way, if the understanding of gravity being inverse square to the distance was known before Newton officially defined gravity. Would that concept of gravity being inverse square to the distance not be considered an idea that lead to the Newtonian definition of gravity? That idea is in the Newtonian definition. Rousseau's idea that there is no private property is a socialists idea. Your idea that the land owners should give more to their workers less they revolt and take from the land owner is a socialists concept as well.
I'll give you the benefit of the doubt and accept all of the statistics you've provided. Are you suggesting that by merely foregoing cell phone ownership, avoiding modern transportation, and eschewing indoor plumbing, thereby returning to conditions comparable to those experienced by serfs, they'd only need to work a few minutes per week to support their newly-lowered standard of living?
If you owned the technology you could work significantly less. How much depends on how fast a person could plow with a tractor, seed with machinery, spraying with herbicide, insecticide and fertilizer, mowing/harvesting with a tractor, and transporting to sell. You would also need to account for costs to maintain your tractor, amortize your equipment over it's life, and consumables like seed, fertilizer, insecticides, herbicides, and diesel. I don't know where your coming up with minutes per week but you could definitely work much less.
The seasonal migrants all ready do work less only 1/4 of the the year. The year round workers don't own the technology so they don't see lions share of the benefit but yes if they choose to forgo modern technology they would not have to work as much to provide for them selves.