so it's time to buy these currencies. while they're in decline because of delisting .I think in the future will grow .
Did you really understand the topic? OKex is delisting the coins which means that it can't be traded anymore. Why are you buying coins when you can't do anything with them and at the same time, you already lost your money when you get those dead coins.
It needs to be informed to the community and things to say. Let the community know what is going on.
You are already informed when the OP open this thread. So you should do appropriate actions on your end already. I'm sure that OKex will mail blast its customers as well. They are one of the top exchanges, so I'm sure its a priority to let all their user based updated with the news.