... and none of
are suitable for, or intended for, .local domains. Since the whole RFC is barely longer than it's URL, I can only conclude that anyone mentioning that URL in this context is trolling.
.local was in use. It was deliberately stolen for another use, in order to make trouble for people who were already using it. Because there is a group of people who (a) think every host should have a globally accessible MAC, IP address and URN, and (b) think that the internet should be reserved for people who agree with them.