Never picked up Gloriantha, so that’s all news to me!
it's clear in RQ III (the Avalon Hill &/or GW editions) in the bestiary, and in HeroWars...
It's notably absent in the Mongoose RuneQuest first edition core and monsters books.
It's also not present in the 2nd edition core, but it's hinted at. It is, however, explicit that there are 4 types of Aldryami - Elves, Dryads, Runners, and Pixies. And they share one cult. And distrust (often to the point of hatred) Dwarves.
Plus, older RuneQuest/Glorantha don't have halflings; but ...
Mongoose's editions added them. I don't know if newer non-mongoose editions do. Also note: I don't have any of the 1E/2E Chaosium editions material except the core, and only have the core and a couple supplements for 3E... but the AH/GW 3rd ed is chock-a-block full of goodies.
RuneQuest, especially if using Glorantha, is odd... genderless dwarves, plant-based elves, a cubic world, chaos monsters right out of the Eternal Champion series and Lovecraft...