I've searched the entire code base and can see no mention of 5 categories. The ProVIP limit is 4. As a test, I momentarily downgraded your profile to the Basic membership level and could not see mention of the 5 category promise on your profile. There is an upgrade note saying that you will have 4 categories if you restore your membership to the ProVIP level, however.
Please let me know if you see this in the future.