The sign is obviously a fraud, made by right wing trolls to discredit.
A short search finds it rather quickly.
"Supreme Islamic Council of Victoria" does not exist, the "Supreme" has been inserted with what right wingers take for a "tongue in cheek".
There is no "City of Greater Melbourne" either.
Even the xenophobic "barenakedislam" (lmao
) says that it is a fraud
http://barenakedislam.com/2018/01/26...australia-day/
http://boards.4chan.org/pol/thread/1...ahhahhahahhaha
https://twitter.com/notcursede?lang=de
and so on..