Why do you think so? As per my experience, C-Cex runs the wallet for at least several days after the market removal, so users can move their coins out of exchange (if blockchain works of course!). I have never left delisted coins on C-Cex for longer than 1-2 days after delisting, so I don't know how long they will keep the ability to withdraw the coins, but leaving for up to 1-2 days is safe (C-Cex may change this at any date of course, but for now what I wrote is tested and true).
Because of this sentence "Those coins retrieval after the removal date will not be possible." I guess you could take that chance if you want.
Lets hope the dev publishes some stuff over the next days to create excitement and some volume so that the delisting goes away and withdrawal is not necessary. Having said this, it is a waste really to leave coins on an exchange if one could earn stake on it. In addition, the more people stake the more secure the network is. It seems that with WOC2 many people just left their coins on the exchange after the swap and only a small % are staking.