I might have ignored my holdings for several months. That is no excuse for an exchange to empty a wallet of tokens. Listed or delisted should not matter. If a token is erc20 then it is an etherium token and used the etherium blockchain. No exchange should be taking tokens from your personal exchange wallet. It is theft! It’s like a bank taking money out of your account for no reason!
You have to input codes and 2FA to make trades and withdrawals but Kucoin can remove funds with absolutely no contact to you? It’s theft!
They have notified you through email to withdraw your holding from the exchange. Why didn’t withdraw at that time? Due to various reasons like low volume, they can delist the coin and you have agreed to follow their rules when joined Kucoin.
Anyway, as all the time they used to say, "Not your keys, not your coins." Be aware.