skinny guys got that wiry strength that makes no physical sense

Farming + Homesteading + Construction = Strength built from doing constructive things, like moving feed, harvesting, planting, watering, ploughing, cleaning, building etc. Gym = Simulated strength built from repeatedly lifting simulated weights to replicate natural Farming strength, often in ways that do not result in the same capabilities and paying to lift those weights while not doing anything constructive. Homestead > Gym

Farm strong is a real thing. Gym lifts like cleans, power cleans and hang power cleans can approximate the kind of real work that farmers do but farmers spend a longer portion of the day lifting than most gym rats. Imagine doing heavy power cleans for 4 hours a day.

Functional strength vs strength for show.