Proponents of evolution often attempt to discredit creation by pointing to occurrences of microevolution, such as speciation, adaptation, etc. To the evolutionist, microevolution is vindication for their belief in the much larger macroevolution. Their belief is that if these microevolutionary changes have enough time to accumulate, then eventually this will lead to a macroevolutionary change. And therefore, in their way of thinking, if microevolution is a well established fact, macroevolution must logically be an established fact as well.
Sorry, your cite misunderstands micro and macro. They are the same process. Creationists look at the results and think the process is different, but it is not.