This is accurate, and a big reason why the EU officially passed a resolution against U.S. domain seizures.
All SOPA can do without infringing upon another country's sovereignty would be to remove the DNS entry on the U.S. servers that ties back to a foreign server, but they can't impact the foreign content itself without violating world law. The EU resolution strengthens that by saying that if the U.S. had hoped they'd be able to censor foreign content, the EU isn't going to just casually allow that to happen.
All SOPA can do without infringing upon another country's sovereignty would be to remove the DNS entry on the U.S. servers that ties back to a foreign server, but they can't impact the foreign content itself without violating world law. The EU resolution strengthens that by saying that if the U.S. had hoped they'd be able to censor foreign content, the EU isn't going to just casually allow that to happen.