The unavailable status can only know if an item is unavailable after someone fail to order it and received the specific ITEM_NOT_IN_ENROLLMENT error code. This has been explained over and over again: this system can generate both false positive (in case of restocking) and false negative. I try to avoid false positive over having false negatives.

Similar thing for the Hide gold tier option: Vine Helper has to guess if an item is Gold based on various criteria, for one thing, it canot hide an item without knowing the ETV of said item. And again, for the sake of fairness of access, and because Vine now validate things server side, VH will side on displaying the item to you if it's not absolutely sure it's a gold item.

I'm sorry Vine Helper did not meet your expectations, but there are technical limitations to what it can do given the information it can get from Vine.