I don’t think this is true. The commonly cited reference is James Madison’s Federalist Paper No. 10, I’ll provide the relevant excerpt and a Wikipedia link, though I’ll urge caution as they aren’t authoritative sources by any means. Bolding is mine.

Preamble

Federalist No. 10 continues a theme begun in Federalist No. 9 and is titled “The Utility of the Union as a Safeguard Against Domestic Faction and Insurrection”. The whole series is cited by scholars and jurists as an authoritative interpretation and explication of the meaning of the Constitution. Historians such as Charles A. Beard argue that No. 10 shows an explicit rejection by the Founding Fathers of the principles of direct democracy and factionalism, and argue that Madison suggests that a representative republic is more effective against partisanship and factionalism.

Cherry-picked quote cited by Garry Wills

Garry Wills is a noted critic of Madison’s argument in Federalist No. 10. In his book Explaining America, he adopts the position of Robert Dahl in arguing that Madison’s framework does not necessarily enhance the protections of minorities or ensure the common good. Instead, Wills claims: “Minorities can make use of dispersed and staggered governmental machinery to clog, delay, slow down, hamper, and obstruct the majority. But these weapons for delay are given to the minority irrespective of its factious or nonfactious character; and they can be used against the majority irrespective of its factious or nonfactious character. What Madison prevents is not faction, but action. What he protects is not the common good but delay as such”.

EDIT: Here’s where I first heard of the argument that the US is not a democracy (in the sense it’s thought of by everyday use, as opposed to the Greek which involves the concept of demos. He’s a Marxist, thought it might be relevant and wouldn’t want to waste your time only to figure it out later.

EDIT EDIT: I didn’t even make my point, whoops. I think the founding fathers were not unaware of the current state of affairs of the electoral college being probsble, rather it was included by design.