The title here mostly doesn't match the article right? Quote: "But unlike the capital growth tax, capital gains tax will, in principle, only be levied at the time of realisation. This is usually when the relevant asset is sold, but also when immovable property exits Box 3 for another reason, such as emigration."
The article indicates that the Dutch government has decided to treat startups and real estate under the bucket "capital gains", and stuff under "capital growth".
So for an more informal standpoint, the title is a reasonable way to summarize what's happening to the layish person.