macrocephalopod

The "explanation" is lack of convection in space which slows aging. If we assume it stopped the aging process completely (unlikely) then you are comparing the same wine from the same vintage at 20 vs. 21 years of aging. No one can tell the difference.

They asked two experts, one couldn't tell the difference and the other thought the wine that had stayed on earth tasted younger, the opposite of what you should expect given the explanation in the article!

Isn't that common with a lot of things related to wine though?

There’s stuff which clearly does make a genuine difference — grape variety, producer (and production method), vineyard, vintage. Experts in blind tastings can reliably tell these apart.

Then there’s stuff which clearly makes no difference to the taste even though people say it does — like the shape of the wine glass.

Wine glass shape definitely matters, since it affects the relative proportion of alcohol vs. other volatile compounds in the nose. Try drinking armagnac out of a champagne flute vs. a brandy snifter for an extreme illustration