Yep. My PDF of the 3rd edition 1979 7th printing says:
GOBLINS (and Kobolds): Goblins and Kobolds see well in dimness or dark, but they do not like bright light. When fighting in full daylight or bright light they must subtract 1 from their Morale Rating, as well as 1 from any die rolled. Because of their reciprocal hatred, Hoblins (Kobolds) will automatically attack any Dwarves (Gnomes) within charging distance. Hobgoblins fight as Armored Foot and defend as Heavy Foot. Their Point Value is 2 1/2 .
Morale Rating — 5 Point Value — 1 1/2
So the gnome hatred seems to be there as well.
There is a note in the 1979 printing that says it is revised and expanded so I could not say what the original that OD&D was based on specifically said.
Was that your typo, their typo, or a never-seen-again crossbreed race? Because knowing D&D, hoblins could be a legitimate monster.
Chainmail seemed to double up a lot of things with similar combat stats:
Sprites and Pixies
Dwarves and Gnomes
Goblins and Kobolds
Elves and Fairies
Heroes and Anti-Heroes
Trolls and Ogres
Rocs (including Wyverns and Griffons)
Elementals (including Djinn and Efrett)
Basilisk and Cockatrice
Wights and Ghouls
From the parentheses used in the descriptions, it looks like Dwarves and Goblins were opposite numbers as were Gnomes and Kobolds.