[brenniemac]

I think more specifically this is referring to heroes from Dota (which of course links back to Warcraft III as you said)

[Zekio]

nah, they are just the default heroes that exist in Warcraft 3 Reign of Chaos and Frozen Throne, which is easily discerned by the names and the fact the races are listed as titles and the Neutral heroes doesn't have a race mentioned in English

Also there are a lot more heroes in the Dota map for Warcraft 3 than on that short list