hi nick
yes, of course the fruit differs as to the area it's grown. It also differs as to when it is picked, when the flowers were pollinated, what the weather was like that year etc. That's the same with all fruit (and any plants for that matter). For instance, with varieties of apples; the "Ozark Gold" variety off the same tree was very different this year, than it was last year. And so was the "MacIntosh" and the "Devonshire Quarrenden" etc.
There is a lot that influences the chemical composition of the fruit; weather variations, the soil, the microclimate (just as much as the mesoclimate).
What you've quoted is just marketing from those who want to sell you their "special" Goji berries. Goodness! There is so many valuable medicinal plants. All with their differing properties. And all differ as to where they're grown, seasonal differences and how they're harvested and stored. Lycium barbarum is a good medicinal fruit, but for goodness sake, don't buy into their marketing that only their special Himalayan and Tibetan Goji berries have "the unique quality".
Qualified Oriental Medicine practitioners have studied for 5 (plus) years. They know their medicine far more thoroughly than some company who's "discovered" a medicinal plant, and are packaging it as a cure all.
For goodness sake, make sure that your wife sees a qualified Oriental Medicine practitioner/ Traditional Chinese Medicine Doctor.
By the way dried Lycium Barbarum are very strong, and in my opinion, I don't think your wife should be ingesting too many of them. I'd more say things like nettle and bone marrow soup. But it really is best that she sees a local Oriental Medicine practitioner.
In the mean time, see how the Lycium Barbarum grows in the different microclimates in your garden. See how it differs from year to year, and from when you harvest it, and how much water and nutrients it receives etc. And have a look at it's polysaccharides and spectral peaks from each harvest.
cheers
Fern