Winemakers, like athletes, give similar answers. The bag of tricks bulges. You're old enough now to know about these things. Not everything you see is real. It was a good-enough wine on its own, but these days, in order to leap out in those big blind tastings, you gotta be big.
Nobody ever looks at a scrawny wine twice.
Ah, that's the question. Believe me, nobody's admitting nothing. There's an underhanded element to it, a quick-fix aspect that smacks of deception. For starters, though, it's a pretty good bet that many, if not most, bulk wines see some concentrate. For such wines it's a swell thing.