That’s simply not true, and calling it "revisionism" doesn't make it less factual. Somalis were active agents in the early coffee trade not just selling to Yemenis, but establishing their own trading quarter in Mocha, alongside European and Jewish merchants, where they sold coffee directly.
Here’s a map from 1764 clearly showing the Somali quarter outside Mocha's walls:
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alteagallery.com
This is backed up by contemporary accounts as well. Take this British observer’s report from the early 19th century:
Coffee passed through Yemen not because Somalis lacked interest in wider trade, but because Yemen was geographically the key transit point. European buyers British, Turkish, Dutch, etc. purchased coffee directly from Somali, Arab, and Jewish merchants in Mocha, not through some one-way Somali to Yemeni pipeline.
Also, Somalis traded coffee across the wider Horn, East African coast, and inland regions as well. Limiting their role to “just selling to Yemenis” is not only inaccurate, it ignores the broader trade system they were deeply embedded in.