As I said, many, many cars take 4-5 quarts total. And many of them can go approx 10,000-12,000 miles with TBN to spare. So my math is sound. 14 quarts will give you an easy 3 OCI on those cars. That's 30-36k miles and they are playing it safe.
Results are impressive for sure. Amazing, nope. If I did 100,000 miles on an oci but my sump was 50 quarts, that wouldn't be as impressive as my sump being 10x smaller and doing 100k miles.
14 quarts and 50k miles is approx 3600 miles per quart. If it's the world record I'll concede here that the results are amazing but I bet there are plenty close to that. Time to make a record oci thread perhaps?