Yes, but note that you pay tax on all the profits in the investment savings account (OST) in proportion to the size of the withdrawal, not just on realized gains. So, let’s assume you’ve deposited 50k into an OST, then expertly traded it up to a market value of 100k, and you withdraw 10k. Half of this 10k is considered profit and is taxed. It doesn’t matter if you’ve actually only made a profit of a thousand. In OST withdrawals, taxes are also paid on unrealized gains. That’s why it’s really unsuitable for frequent money in/out movements.
Losses on an ordinary brokerage account (AOT) can also be deducted in future years; I think the limit was 5 years, or what was it.