Perelandra never existed

CS Lewis wrote a triad of novels about the planets in this Solar System, based on the knowledge he had. He already knew that Mars was mostly dead; hence why he sequestered its civilisation in the Marinaris. At the time, people wondered more about Venus. Well that got debunked in a decade or two. But maybe we can salvage Perelandra if the events took place after time travel!

Here's the latest: Venus never had water on its surface. It was steamworld until its dynamo died and then it became ... what it is. Unless you count supercritical carbondioxide as a fluid. By extension it never got tectonic plates either.

Next question: how about underground? There is recently posed a mantle-generation hypothesis of oxygen alchemy; although of course that doesn't create hydrogen.

OR NOT? 10/29: On poor constraints.