> Is the article wrong?

Yes. Or more to the point, it is uncritically repeating the medical theories of its eighteenth-century sources, which were wrong. See also [0], [1]. People had a really hard time figuring out how to stop scurvy, and the use of citrus as a remedy was not generally accepted until well into the nineteenth century.

> Does beer have vitamin C?

No.

> Does beer have something else that also cures Scurvy

No. Scurvy is vitamin-C deficiency.

[0]: https://pubmed.ncbi.nlm.nih.gov/12810402/

[1]: https://slate.com/news-and-politics/2011/04/the-budweiser-di...