I would say that many breeders actually breed true-percs. With any onyx or picasso pair of fish, not every fish will turn out as said coloration. The others "leftovers" are true percs. ORA sells true percs - they are most definitely tank-raised.
You could contact any number of Onyx breeders to obtain a fish with the coloration you posted, they will have many that look like that fish that just didn't develop full onyx coloration.