"Works with" is not the same as "is part of". See my example of oxygen and iron. They may work together (or separately) but they are not the same. Iron is not part of oxygen and oxygen is not part of iron (iron may bond with oxygen to form iron oxide or rust).
Link is trying to sell their own vitamins. Why don't they add copper to their vitamin C if it is so important and not "real vitamin C" without it?
https://www.totalhealthsecrets.com/ENGLISH/catalog/Truly-Natural-Vitamin-C-8482-270-g_1103.html
The cherries have practically no copper.
https://behealthy.today/acerola-cherry-content-benefits/
Though they do have vitamin C:
(Video says Vitamin C never naturally occurs in more than 100 mg so we know it is wrong).
But he says they are "real vitamin C" so I guess "real vitamin C" does not require copper. Or it was just a sales pitch. Get you to buy some copper to go along with it.
Only $80 a pound for dried up cherries (plus shipping). These guys will sell you a pound for under $20.
https://nuts.com/driedfruit/cherries/cherry-acerola.html
And as was shown earlier, vitamin C can interfere with the body's ability to use copper. More vitamin C means lower copper in the body. That is not a good synergistic relationship.
Loved the comments at the video.