"wealth tax" is a different tax on income, inheritance tax ended in 2005.
That said, even in 2000 there was a recognition that there is an intergenerational wealth transfer competent via foundations and families.
And clearly, the big picture takeaway that has been open knowledge in the economics world is that Sweden has consistently had extremely uneven asset ownership - at a level comparable to the United States and Netherlands, two other first world countries dealing with extreme amounts of instability due to asset ownership inequality. And at the end of the day, assets matter more than income.