The cork had behaved; its colour was copper; but in this case evidence of botrytis, not oxidation. I’m not very familiar with the Rheinhessen area of Germany; haven’t visited, and haven’t tasted much – more homework is needed!
The Rheinhessen is Germany’s largest wine-growing area, often used in making mainly innocuous white wines, but has undergone a re-evaluation with some very serious winemakers (such as Keller).
Its Australian importer Cellarhand has some helpful notes on the producer, site and winemaker here. The gold capsule indicates the wine is “more” than a basic Auslese.
The wine presents with raisin, red apple, dark honey, orange peel, and fruitcake spices, plus a hint of syrup and wax; the palate is vibrant and unctuous; stonefruit impressions add to the mix. Bounteous residual sugar is balanced by acidity; the compelling richness and freshness tempts further sipping, analysis and enjoyment. No hurry to drink (cork permitting).
94 points, and drink to 2028 (cork permitting).