Hidden attributes are no longer hidden?

In DOORS 8.3, it is possible to hide attributes from the DOORS user interface using the
AttrDef modify(AttrDef, setHidden, true)
function.

While this function still executes in DOORS 9.3, the attributes are not hidden in the DOORS user interface. Is this a documented change in functionality?
SystemAdmin - Fri Feb 08 10:15:09 EST 2013

Re: Hidden attributes are no longer hidden?
SystemAdmin - Sun Feb 10 17:36:55 EST 2013

If you can interpret what it means, the help file says: Whether the attribute definition is for an attribute that is hidden. This function is provided only for forward compatibility with future releases of Rational DOORS.