The weird thing to me is that it feels like there was a collective, not quite simultaneous decision to reject informed democracy. Like they'd grown bored of unspectacular but competent government and wanted to risk wrecking it all for the sake of something new. "Intelligence? Science? Nuance and compromise? Pah, just give me the right-wing populist idiot who tells me the lies I want to hear."
It may seem strange until you look at what has been happening in the world particularly over these past 10 years. Specifically, I'm talking about the rise of social media as well as the generally increased reliance people have on online sources of information.
The researcher in the OP's link is correct in his diagnosis. The internet is in the process of destroying democracy. Ironically, the democratization of information is undermining the democracy of actual government.
The real question is how long it lasts. There's evidence of people turning away from it, such as the exit of Malvini in Italy, the replacement of Zuma in South Africa, the meltdown of Boris Johnson's government and, of course, the 2018 US midterms. The question is whether or not these changes will both continue (the ultimate test being the 2020 US election) and take the planet back to some semblance of reasonable, fact-based government.
The hope is that liberal democratic culture has fermented long enough to have a built in immune system. Not to reject bad ideas from the populist right. Humans are incapable of rejecting bad ideas when delivered in just the right emotional pitch. Rather, to reject such ideas only after they have gained some traction in actual government, as they did in 2016, then resulted in demonstrably
terrible consequences. And by that, I mean consequences worse than what we've seen so far. If OTOH the authoritarianism increases only gradually, desensitizing us to each new injustice or indignity at each step, then I'm afraid we're in real trouble.
This is why, for example, I keep saying in every Brexit thread that I actively desire a no deal Brexit for the UK. The people who voted for leave need to see that their country is suffering as a result. If they do not, they'll just keep voting for the same bad policies based on the same nationalist and nativist instincts. We aren't going to convince these people with any words. They'll only be convinced when they can see the disaster these ideas have caused.
Time will tell if this authoritarian trend has peaked or is still in early stages.