A factoid is basically a junk food proposition, it can be false or it can be true but insignificant. Just like how junk food refers to both foods with a lot of empty calories (and so are unhealthy) as well as ultra-processed foods (which need not be unhealthy, but aren't beneficial either). The individual you're replying to is using the term correctly.
I switched coffee for Yerba Mate a long time ago. It probably has similar supply chain issues to be honest but its isolated in a specific part of Brazil and Argentina from what I know. @josie@vegantheoryclub.org have you ever been to a mate growing region?
Yeah last time this came up someone posted another article about people trying it… the voice tastes bad and the only reason it’s expensive is part of the marketing.