According to the article, there are 37 exceptions out of 230 languages. Tea, with its two principal words, is actually above the average compared to a typical word for something that was unknown to the world at large until early modern times.
Well, tea was considerably earlier. Quoting a few Wiki snippets: "As prices continued to drop, tea became increasingly popular, and by 1750 had become the British national drink." vs "Prices of aluminium dropped, and aluminium had become widely used in jewelry, many everyday items, eyeglass frames, and optical instruments by the early 1890s." so it's early 18th century vs late 19th century. Late 19th century would be around the time you started having rapid long-distance communication via telegraph and telephone. Literacy, letters and newspapers were far more widespread so it'd be much more useful to have a common, global term than in centuries past. Post-radio and post-Internet even more so, unless you absolutely want your own word for cultural identity or language purity.