People are also using “populism” here to be a solely negative political movement associated with the right wing, but it’s just a matter of people thinking the people running society aren’t doing a good job for the majority. Not sure if that’s intentional or not, but it’s a value-neutral political expression. Anywhere you say “populism” you should generally be able to substitute “anti-establishmentism” and it’ll be roughly correct, but doing so in a lot of these comments doesn’t make sense. The establishment isn’t inherently good, though I can see why the head of the largest religious establishment in the world might consider challenges to it bad.