The normal course of politics is various coalitions of elites and populace, each drawing from their own power bases. A normal political party, like a normal anything else, has elite leaders, analysts, propagandists, and managers, plus populace foot soldiers. Then there's an election, and sometimes our elites get in, and sometimes your elites get in, but getting a political party that's against the elites is really hard and usually the sort of thing that gets claimed rather than accomplished, because elites naturally rise to the top of everything.

But sometimes political parties can run on an explicitly anti-elite platform. In theory this sounds good - nobody wants to be elitist. In practice, this gets really nasty quickly. Democracy is a pure numbers game, so it's hard for the elites to control - the populace can genuinely seize the reins of a democracy if it really wants. But if that happens, the government will be arrayed against every other institution in the nation. Elites naturally rise to the top of everything - media, academia, culture - so all of those institutions will hate the new government and be hated by it in turn. Since all natural organic processes favor elites, if the government wants to win, it will have to destroy everything natural and organic - for example, shut down the regular media and replace it with a government-controlled media run by its supporters.

When elites use the government to promote elite culture, this usually looks like giving grants to the most promising up-and-coming artists recommended by the art schools themselves, and having the local art critics praise their taste and acumen. When the populace uses the government to promote popular culture against elite culture, this usually looks like some hamfisted attempt to designate some kind of "official" style based on what popular stereotypes think is "real art from back in the day when art was good", which every art school and art critic attacks as clueless Philistinism. Every artist in the country will make groundbreaking exciting new art criticizing the government's poor judgment, while the government desperately looks for a few technicians willing to take their money and make, I don't know, pretty landscape paintings or big neoclassical buildings.

The important point is that elite government can govern with a light touch, because everything naturally tends towards what they want and they just need to shepherd it along. But popular/anti-elite government has a strong tendency toward dictatorship, because it won't get what it wants without crushing every normal organic process. Thus the stereotype of the "right-wing strongman", who gets busy with the crushing.

So the idea of "right-wing populism" might invoke this general concept of somebody who, because they have made themselves the champion of the populace against the elites, will probably end up incentivized to crush all the organic processes of civil society, and yoke culture and academia to the will of government in a heavy-handed manner.