They only just changed the laws a month ago to make it so opaque and vague about who qualifies as a tax-resident or not. It's basically a "if we want we will tax you" situation. The 183 day rule means little if you have even something as innocuous as a bank account back home now. It's a ridiculously stricter change that is entirely open to interpretation by the ATO.
https://www.mondaq.com/australia/income-tax/1070880/tax-resi...