I don't have much experience with Collabora but what I have wasn't great. I'm very much in favour of governments ditching MS for something like Libre Office. But I also know that the formatting errors can be a pain in the røv especially if you have 20 year old Excel sheets full of important information spiked with macros that civil servants who have long since retired made ages ago. It's minefields within minefields.
So I think many things can be true at the same time. Denmark would like to rely less on American software and services. It was in the interest of the government to communicate that loudly at a time when the mad orange hand was reaching for Greenland (and may do so again because what's in a treaty?). The Collabora trial could have been an earnest effort that failed for many reasons I don't have trouble imagining. Or it was a show piece, a signal to the Danish voters as well as American companies. Your contacts may not be as certain any more. It may have led to some increased MS lobbying bts. And this doesn't mean this is the end of the effort. Just this one, at this point in time.
The big problem is this: success stories of governments switching to something open source are rare. You don't win elections when people are fed up with long processing times in government services. They'd have to be sufficiently pissed off with the mad orange to tolerate that out of spite. And with the urgency of the Greenland crisis having subsided, the level of pissedoffness will have also declined.