No, they are asked to detect price.
(...) some wines would be presented to the panel three times, poured from the same bottle each time. The results would be compiled and analysed to see whether wine testing really is scientific. The first experiment took place in 2005. The last was in Sacramento earlier this month. Hodgson's findings have stunned the wine industry. Over the years he has shown again and again that even trained, professional palates are terrible at judging wine. "The results are disturbing," says Hodgson from the Fieldbrook Winery in Humboldt County, described by its owner as a rural paradise. "Only about 10% of judges are consistent and those judges who were consistent one year were ordinary the next year.
https://www.cambridge.org/core/journals/journal-of-wine-econ...
https://www.cambridge.org/core/journals/journal-of-wine-econ...
https://www.cambridge.org/core/journals/journal-of-wine-econ...
Heck, they can't even distinguish wine with artificial coloring from actual red wine:
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.