Isn't CKB produced by mining blocks? How can there be unlocking? Who can answer this question? Thank you!

Nervos Network (CKB) will unlock 1.34 billion tokens at 8:00 on November 16, worth about 19.82 million US dollars, accounting for 2.99% of the circulation.

·08:00 Token unlocking Mintlayer (ML) will unlock about 991$CKB at 8:00 on November 16