Well, he still had Mercury as a "one face" world. But he did have Venus as a nasty place with a poisonous atmosphere, so he was closer to right there than all the "wet, jungle planet" folks.

His Mars had just an unusable wisp of atmosphere, but still had some plant life. So that's a 50/50 split.

And, of course, like everybody else he totally missed Jupiter's radiation belts. Of course, back then we didn't know about *Earth's* radiation belts.