As of August 1st 2023, Lido officially stopped support of Lido on Kusama.
Termination of support does not affect your staked funds in any way, and kusama.lido.fi will remain active for claiming unstaked assets.
All staked tokens have been successfully unbonded, and claiming of tokens without any wait time is now possible. Deployed smart contracts remain active until the last tokens are claimed, so alternatively you can unstake via direct contract interaction, i.e. via explorer.
Navigate to "Contract" section.
Navigate to "Write as Proxy".
Connect with your wallet.
Claim your tokens by calling "claimForcefullyUnbonded (0xd0564dce)".
Voila. After this, you will see your unstaked KSM tokens in your wallet.