What does rule XXXV mean? If a Death Note owner accidentally misspells a name four times, that person will be free from being killed by the Death Note.


What does that rule mean? I think I'm misunderstanding it, and I'd like to know, what the rule really means.
Wiki
The rules related to misspelling are:

Rule IX


The Death Note will be rendered useless if the victim's name is misspelled four times.



Rule XXXV


If a Death Note owner accidentally misspells a name four times, that person will be free from being killed by the Death Note. However, if they intentionally misspell the name four times, the Death Note owner will die.
The person whose name was misspelled four times on purpose will not be free of death by a Death Note.




So if we put all these rules together, that means that if you misspell a person's name four times on accident, that person is free from being killed from the Death Note forever. However, this does not mean you could make a person untouchable from the Death Note on purpose. The second rule from XXXV prevents this from happening. If someone purposely misspells someone else's name four times, he will kill himself and the victim will remain as is.
Manga
The manga seems to contradict this though. We have seen Light misspelling the name of a criminal more than four times, yet that person still ended up death. So if the rules are correct, it must be that one of the first four names Light wrote down was the real name of the criminal. Although I do find this a bit of a stretch, so I'm not really sure what is going on here. Ohba did make Light write down the criminal's name more than four times, but on the other hand, there was two occasions where he mentioned misspelling (rules IX and XXXV), so I'm not completely sure what to believe here.