None of this is true. The vaccination rate in Denmark is 77%, not 90% [1]. The number of hospital admissions and the death rate are lower than during the first and second waves [2, 3] despite a significantly larger infection rate [4].
On 1: The discrepancy in percentages is usually the difference between "Entire Population Vaccinated" and "Eligible Population Vaccinated." Which, until very recently, was only people 12 and older.
Given the exceptionally low incidence of death in the 12 and under group, it's debatable which figure should be given prominence.
On 2 and 3: The case rate is spiking significantly higher than it has ever before, and the death rate is on an upward trend. It is typically delayed behind the case rate, so we can't be certain that this will be as bad as it gets. It's still very possible for this wave to be more deadly than prior waves, even though the Case:Death rate is lower.
Instead of showing 2 & 3 separately, perhaps the combined chart [1] is a better visualization.
[1] https://ourworldindata.org/grapher/share-people-fully-vaccin...
[2] https://ourworldindata.org/explorers/coronavirus-data-explor...
[3] https://ourworldindata.org/explorers/coronavirus-data-explor...
[4] https://ourworldindata.org/explorers/coronavirus-data-explor...