That's pretty funny. Though what I think they're saying is that the total size of the result-space for their planet generating algorithm is, whatever, hundreds of quadrillions or quintillions or whatever it is that makes that work out, but that a given instance of the universe comprises tens of millions of planets.
“If you were to visit one virtual planet every second,” he says, “then our own sun will have died before you’d have seen them all.”
...
"The tens of millions of planets that comprise the universe are all unique."