Yes assuming you've had no other capital gains from other...

Yes assuming you've had no other capital gains from other investments, then both your $9k loss from 2019 and your $170k loss from 2020 would be carried forward to 2021. Therefore for next year you would have an opening balance of $179k capital losses brought forward. Basically your accumulated losses carry forward forever, and will only reduce when you have some capital gains to offset or 'use up' the loss balance.

However, given we're talking large numbers here, and I'm only commenting based on the numbers you've provided without having any other knowledge of your financial situation, I really would advise just getting a tax agent to check it over before you lodge.