What about posting pictures of his house? That seems like a huge invasion of privacy to me and it was completely gratuitous IMO.

For better or for worse[1], we have a very strong protections on speech in the US. Although the specifics need to be addressed by his lawyer, in general Dorian needs to prove Newsweek did wrong, and that's a tough hurdle.

[1] I think "for better" but this is showing one of the sadder side effects.

And it's examples like this that show why I think the USA's "right to free speech at the expensive of right to privacy" is bad IMO

People don't sue for libel in the US. They do it in England, where you can secure a libel judgment over practically anything.