To expand on that a bit:
Developer level errata is usually either put in by a member of the MUL team, a writer, Paul or someone with a white/grey Battlemaster. Nobody else will put out developer level errata.
Rules level errata falls under the same rule, but is usually put in by even less members, the MUL team is cut out with the exception of Xotl, who runs the errata.
As long as it is not put into a thread by any of those people, it is not final.