The vaccine in trials was 100% effective in preventing infection by Type 16 and Type 18 HPV. There are other strains of HPV that cause cervical cancer that the vaccine doesn't protect against -- Types 16 and 18 are the two most significant strains, responsible for in excess of 70% of cancer cases.
That is NOT what it says. It says it MAY help guard against those 4 types. It does NOT say it will prevent those 4 types. It's junk and you can't make it something it's not no matter how much you spin it.