ipv6_ipfilter_rules= is obsolete ?

In /etc/defaults/rc.conf I see this

ipv6_ipfilter_rules="/etc/ipf6.rules"
# rules definition file for ipfilter,
# see /usr/src/contrib/ipfilter/rules for examples

man 8 ipf  says

ipf -6  ipv4 and ipv6 rules are stored in a single table and can be read 
from a single file. This option is no longer required to load ipv6 rules.

I interrupt this to mean that the ipv6_ipfilter_rules="/etc/ipf6.rules" 
   line in /etc/defaults/rc.conf is obsolete and should be removed 
before RELEASE 13.0 is published for users to use.