One of my professors in grad school was really into wine and every couple of years he would put on an after-hours wine tasting class for a semester. One of the points he made was that there are absolutely wines which are objectively better and worse and that experts can reliably tell them apart. He had met enough experts who could identify a vineyard and vintage blind to know there was something to it. But sitting on…
Identifying a specific wine is easy, even non experts can learn to do it.
What experts have shown to fail is telling good wines from bad wines, cheapo wines from expensive wines, and so on, in blind tests.
There they are not asked to identify a label and vintage they already known and are familiar with (because they drank it before), but to detect quality.