You’ll find the pool fencing regulations for NSW here. The location of the fence varies depending on when the pool was installed but the dimensions and structure of the fence are fixed to the latest standards, based on where a small child could conceivably get through, under or over it.
On the question of liability, Peter is right. The owners corp is the management of the building, the strata manager can only act on your instructions.
Whoever did the survey should have indicated where and how the poll was non-compliant and that should be your starting point for modifications.
Luckily, as of April this year, strata schemes were exempted from the law that didn’t allow you to sell or rent a property unless you had a pool safety compliance certificate.