I think the author, like many today who try to disparage democracy, gets too caught up in the founders as scripture and old word usages.
The modern usage of democracy is at least a century old, per the article itself - hardly the 'present moment'.
Democracy is superior not because some founders wrote some scripture, but because of its moral and rational foundation, that all are created equal, all have universal, inalienable rights that include liberty, and thus nobody else has the right to tell them what to do without their consent. Thus only the people can legitimize a government, and governments exist to protect the people's rights.
And yes, oppression of the minority is a danger, but the solution isn't to have some self-selected people take power from the democracy and call themselves a 'republic' (and what stops those people from oppression, corruption, etc. Why would they be superior?). The solution is human rights, as implemented in the Bill of Rights. The majority can't violate the rights of the minority.