Those were the good old days.
I know someone who applied for home loan in 2017, and all banks were asking for a tax return or official employee timesheets.
Getting an ABN may work, but banks may have a list of what occupations and businesses are and are not eligible for a home loan, and again official ATO tax return documents will probably be required
The current Royal Commission into Banks last week heard how a blind woman was given an investment loan on behalf of her daughter, despite not being able to read what she signed. The daughter business went broke and the old ladys house had to be sold
So ... applying for loans is only going to get stricter with time