That’s actually incorrect, as per the blog.
The speed of light is inapplicable because it both has a day/night cycle and is of infinite size, therefore light must be of infinite speed and be able to travel anywhere instantaneously. As stated in previous posts, the presence of an infinite world requires rewriting a lot of physics (depending on it’s shape). For example with the day/night cycle you cannot have a sun/moon orbit the world so you’d need to figure out how to replicate that without that, that’s why I proposed the sphere idea because it makes things much simpler to deal with even if it results in things like the sun/moon orbiting the world.
Why? We’ve already established it is infinite and normal physics doesn’t apply to whose say it can’t just be of a constant infinite size. Why does it have to be growing?
Even assuming it was growing isn’t this negated by the fact it also has infinite volume? Since gravity is effectively a product of both mass and distance wouldn’t that cancel it out? Trying to compare relative infinities is a fair bit convoluted. Otherwise I’m going to have fall back to physics doesn’t work the same here. We also know that the size of the land cannot be equal to only what we know because we can encounter things that come from what we don’t know, like goblins attacks. They can still occur even if I don’t explore.
As for alternate planes and worlds? Not sure, the little fragments from the kickstarter are the only info we have and they are incredibly poor at best and outdated and completely useless at worst.