What it means is it undermines much of that whole "there was water on Mars which means life can exist on other planets which means Earth is not special which means we don't need a Creator" excited mantra they shouted with glee over the discovery of the "lake on Mars".
Did you bother to read the article?
“The ‘wet’ environment, they propose, actually represents weathering similar to soil formation under rainfall...in which only very small, shallow lakes existed on the floor of Gale crater...”