That's actually 20 days before the minimum retention period (180 days) in the archive tier. AFAIK, the total cost will include both the early deletion penalty and the cost of retaining blobs due to soft delete (for more, refer to https://learn.microsoft.com/en-us/answers/questions/1684613/i-wanted-to-know-about-the-pricing-and-cost-detail )
The two or separate/independent from each other.
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hth
Marcin