a) The article is published by a company who's caters to rich individuals who want to gain citizenship in other countries by paying their way in. Morally dubious to begin with.
b) The 54B capital flight figure is unsubstantiated. They cite no sources, only a single hyperlink that redirects to their own completely unrelated webpage??
c) The lost tax revenue estimates also seem to be completely made up. In fact, they make no mention of the figures past the title and introductory paragraph. A complete joke of an article.
If you're interested to know the real numbers, the official national statistical institute of Norway (link below) tracks wealth tax revenues per year. From 2022 to 2023, revenues moderately increased from around NOK 26 billion to NOK 29 billion. 2024 statistics are only due to come out this year.