I am Australian, flying from Darwin to Shenzhen and 3 days later flying to Singapore, am I eligible?

I am Australian, flying from Darwin to Shenzhen and 3 days later flying to Singapore, am I eligible for VOA?
When i was trying to book ticket on Donghai Airlines, found this on the booking page on their website
" TIPS:Destination countries policy restrictions--Purchase one-way ticket, long-term student visa or more than a year of long-term work visa etc. must be hold. so please make sure it before you buy one-way ticket, in case you are unable to check in and pass the immigration."

Thanks