You are wrong, but not just wrong, your wrongness is like, epic. I mean, I've got buckets of sources, the Britannica, you name it, which proves you are wrong. You've been listening to the right wing echo chamber for way too long.
In my entire life, throughout college, at ever level prior to it, (we were taught civics in the 60s) no one, not one professor, teacher, aide, whatever, no one EVER claimed 'American was not a democracy', over and over and over again, it was told, we were told, it was written, and spoken by Republicans and Democrats, Liberals and Conservatives, that AMerica is a democracy. And no one nitpicked on the parochial use ot the term in the Federalist papers.
I've been witnessing this since it started happening. And do you want to know when they started with this delusion? They started hollering 'America is not a democracy' round about the time Republicans starting losing the popular vote.
Bingo!
They can't stand democracy because democracy, it seems, of late, can't stand them.