Seems plausible wrt my experience, though I've only skimmed it. This is gonna be vague but hopefully interesting.
I feel like there's a traditional job market in Denmark, and then a more recent, foreign-influenced market.
Most people work in the traditional market: there's a collective bargaining agreement, and you just get whatever you get. If they really like you, they find some peanuts within the budget that you can have, but you're not going to negotiate a 40% salary bump compared to similar profiles. You're on a fixed ladder that most of the people doing your title are on. Teachers, doctors, a fair few devs who work in traditional firms. Now and again, it hits the news that some union has demanded a bit more money, and there's some back and forth in the media. But nothing changes about the system, if you work one of these jobs, you are stuck with whatever the outcome of the negotiation is.
Now, Denmark is also a modern country with a lot of highly educated, English speaking people who know what people are doing in other countries.
There's a bunch of power traders in Jutland making a ton of money. There's a bunch of startups of the SV type. There's influencers selling toothpaste and makeup. There's guys trying to build nuclear power. There's private equity and consulting. These guys tend have a different ethos when it comes to salary.
It's more correct to say that the job market is split between unionized labor and high-skilled office positions ("funktionær" = "official"), which is basically anything requiring a university education. In recent decades, the latter category has grown exponentially as industrialized economies have turned into service economies.
Collective bargaining and stepladder salaries are not really a thing for officials, and never has been (outside of a few cases in the public sector, like doctors).