My bad, you are right. I thought the original link was referring to the XP mode workaround listed by another author. When I checked the page again, I realized that the link anchor was pointing to a different post.
Why is that cracking? It's just a hack; patching a binary to fix a bug is by no means a crack IMO. A clever hack? Sure, but calling it a crack just serves to make it sound like a bad thing.
That was my big take away too and my sense was that in another forum, he would have used the term hack. But it's easier to explain it away as a crack to convey that users should observe caution, share it quietly, and also to piggy back on a commonly held notion that it won't break or otherwise harm any system (such as the service being used).
Skype is known for their insane obfuscation (to prevent reverse engineering of the protocol), though it doesn't sound like that's applicable in this case.
'User got fed up with the bug and finds a workaround.'