Am I qualified from Macau?

I am an Australian and I am going to Beijing via Guangzhou. My return flight is Beijing-Guangzhou-Melbourne. I already got a single entry visa for my visit to Beijing but I want to go to Macau on the way back (stopover in Guangzhou). Am I qualified to use this policy when I return from Macau, to enter Guangzhou, just from the ferry port to Guangzhou airport (leaving on the same day)?

Thank you!