Does activity archival decrease the storage limit?

Salesforce archives Activities after a year of due date end.

What I didn’t find is – does archival decrease the Storage Limit consumption?
I.e., there’re 1kk tasks in the org and the storage consumed by them is 2 GB. A week later those tasks are archived. Will the storage consumption still be 2 GB? Or it will be 0, since those 1kk tasks were archived?

Please point me to SFDC documentation if possible.