Your wife is, politely, "mistaken". I would guess she has fallen prey to marketing and attractive buzz words. No disrespect - if they didn't work most of the time, for most of the people, we wouldn't have a business in "marketing".
Feeding chickens an optimal diet is COMPLICATED - and humans, as a general rule, don't like Complicated. Honestly, we are a time limited species - we don't have enough lifespan to research things for ourself, se we are forced to rely on others for much of the information upon which we base our decisions. "Influencers".
and "Pastured" is one of those buzz words of uncertain and somewhat nebulous definition. The quality of eggs from pasture raised hens depends almost entirely on the quality of the pasture, though size can help mitigate somewhat for poor production.
As a practical matter, one can neither meet the optimum nutritional needs of one's chickens from their own pasture (in almost every case), and one can not completely feed one's flock from one's own pasture (in almost every case). That's not to say that chickens can't survive on one's own land without a commercial feed (or a home mixed feed - which I don't recommend attempting), simply that the nutritional needs of a modern bird to be most productive are much higher than is available thru nature alone.
Gallus Gallus Domesticus - the domestic chicken - has been bred by man to be far more productive than its jungle fowl ancestors - and that productivity comes with a need for man to provide support for them.
I've been at this a couple years now, my flock is in my Sig below.
My birds free range around five acres, in one of the most forgiving climates in this nation. Its split roughly two acres of pasture and three acres of woods I am slowly clearing to expand the pasture. The pasture is one
I've deliberately planted with a mix of greens. Best case? I save about 35% on my expected feed amounts during the most productive part of the year, and closer to 10% during the least. That's not to say it can't be done better - I hope that it can, its why I keep trying things to improve on what I'm doing. Its merely an example of what should be reasoanble expectations for what can be (relatively) quickly accomplished with limited efforts at continued maintenance.