Most people (55%) in the US earn more than similarly situated people in Sweden [1]. (If you focus only on Swedish Americans, 55% goes up to 85%.) If you want to take paternity leave in the US, you can lower your spending/consumption to that of a comparable Swede and put the money you save in the bank. You can then withdraw it during your paternity leave.
The fact that most Americans choose not to do this suggests that paternity leave is not as blissful as the author suggests. The fact that the Swedish govt had to offer an "equality bonus" and use it or lose it incentives to get men to use more than 6% of the per-couple leave suggests that Swedes don't find it as blissful as the alternatives either.
[1] Income distributions overall: http://super-economy.blogspot.com/2010/03/income-distributio...
Swedes vs Swedish Americans: http://super-economy.blogspot.com/2010/03/super-economy-in-o...
[edit: replaced the word "standard of living" with "consumption". "Standard of living" is a poorly defined concept and arguing over definitions is pointless.]