As discussed in https://mailarchive.ietf.org/arch/browse/netconf/?gbt=1&index=p_zRKwQ6TBxTuCDPc5wJbdZgWTcgWTc, authors expect that the require-instance statement is available not only for leafref and instance-identifier types, but also for all the types derived from them using typedef statement. Since no one argued against this understanding, this errata changes the text to the same form as in other restrictions applicable to derived types.
As discussed in https://mailarchive.ietf.org/arch/browse/netconf/?gbt=1&index=p_zRKwQ6TBxTuCDPc5wJbdZgWTcgWTc, authors expect that the require-instance statement is available not only for leafref and instance-identifier types, but also for all the types derived from them using typedef statement. Since no one argued against this understanding, this errata changes the text to the same form as in other restrictions applicable to derived types.
See Errata here: https://mailarchive.ietf.org/arch/msg/netmod/b640iJm78FcGI7ZTOJnX5_-F9B0