A few hundred years? With what technology? We can’t deliberately terraform this planet in that time period and we don’t have to launch millions of tons of equipment off the planet to do it.

Going from “Some planet has these chemicals in its atmosphere or crust” to “We can make it earth-like” is a huge leap that just gets waved away. We can’t extract fresh water from the ocean economically at scale yet. So far we’ve had lots of failed attempts to land even small probes on Venus.