Question about ILM Delete phrase

Hi, I have a question about the delete phrase in ILM.

I have the ILM policy set when the max 15gb limit is reached in the primary shard then do the roll over and then I want that index to be completely deleted after 3 months.

but the "wait for snapshot policy" states in the delete phrase catches my attention because I don't know what that mean even read the definition below, is that just simply mean after an index is deleted there is still a snapshot can let me recover the index back?

I have also attached my SLM policy as well

Could anyone help me out?

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