My only issue with that, is had it been a regular season game and deemed to be a KM error the mark would have reflected that and possibly reduced that referees average sufficiently that they were no longer in the top 3 or so. Previously as mentioned Ross Joyce's season finished on one wrong decision and there have been examples elsewhere too.
It will come down to interpretation - correct or supportable, wont affect him, wrong match defining incident should. Love to know if asked at interview did he believe (in hindsight) he was correct, what would he say?