Section 26 of the Victorian Residential Tenancy Act sets out what rems there should and shouldn’t be tenancy contracts. At the end it says this:
(3) A failure to comply with this section does not make the residential rental agreement illegal, invalid or unenforceable.
Section 29 details the landlords’ obligations to provide a signed copy of the tenancy agreement to the tenant. Failure to do so could result in a $4623 fine.
I don’t think your landlord would be wise to breach basic tenancy law when they could be fined for not adhering to it in the first place.