We're already being taxed like crazy while that money subsidizes things almost everyone disagrees with. The libertarians believe that if people weren't taxed as much they could voluntarily spend money on things that are valuable to them. Some people would donate more and others wouldn't donate at all, and that's okay. I believe we would see a lot more voluntary donations without the burden of high taxes.
Claiming "libertarians haven't solved this yet" while continuing to take everyone's money is not a fair argument.
To stay on topic, this thread is about a private individual donating to a project he supports. That's something everyone should be happy about. And he did not do it as a political statement.