I always DODD when I see any useful info, Yes you are right, info at website when I google:
Unlock your money at an ATM
Unlock some or all your locked funds at
any UOB ATM in Singapore. Your request will be processed instantly.
For your security, your locked amount cannot be removed or reduced via any digital means, phone banking or any other regular UOB channels. Please maintain sufficient withdrawable balances in your account if you are heading overseas.
https://www.uob.com.sg/personal/save/protect-your-money.page