Each staker can independently claim their reward at any time after the locking period. The staking reward depends on the amount of CLO that are currently in the Cold Staking Contract. As a result, the reward of each staker depends on other stakers claims. We rely on the assumption that with a sufficiently high distribution of claims over time, Cold Stakers have a high probability of receiving a reward close to the expected value.
I try to translate it into my own language and it does not work. It remains a feeling that not all the results are precisely defined and they can change depending on the circumstances.