This is one thing many forget, mostly due to drinking our own koolaid about the inherent superiority of liberal democracy. Authoritarian regimes almost by definition have high public support, because they couldn't function at all if even a relatively small proportion of society went against them. The people who want to overthrow them are either out of the country or insignificant. Dictatorship is impossible without populism.
This doesn't make any sense to me. There are and have been numerous authoritarian regimes that lack "high public support", now and in the past. The entire idea for most authoritarian regimes is to slowly minimize the power of those who oppose them. And then, they spend a huge amount of resources looking for dissent (SD/Gestapo, Stasi, etc.) and trying to control the societal narrative.