those are not true democracies that you mentioned, true democracy is direct democracy
Technically they are democracies, but representative democracies.
The issue with full democracy - aka everyone has voting rights and everyone has the power of proposal is that everyone gets swamped by an insane amount of legal proposals, no one has time to actually figure out what said proposal will be about and there would be just so many of them that people would get disinterested.
As a result you tend to have representative democracies with a number of direct democracy principles worked into them. Referendums on important things for instance.
A republic and democracy are terms that handle different things though.
As to technocracy - it's often proposed to use a random pool of the people inside of the profession to be chosen.
I find that everything mentioned there so far is just another name for plutocracy.
No one mentioned anything even close to a plutocracy. As those tend to require elections limited to a social group, no elections at all or other direct ways of controling who gets inside of the governing body and who does not.
In some cases you can have a faux plutocracy where funding the campaign of becoming a member of the legislative body is incredibly expensive, but legally that is still a democracy as the elections aren't closed to candidates who can't put that money on the table.