See The Solution
The volumes are gone but the volume count on the aggregate hasn't changed and the aggr size hasn't changed either.
Do I need to wait for wafl to reclaim that space? I deleted 15TB of data but the aggr utilization hasn't changed.
The volumes are in the recovery queue:
to see it:
set -priv diag
volume recovery-queue show -vserver <vserver name>
to delete it:
volume recovery-queue purge -vserver <vserver_name> -volume <volume name>
to delete all volume in recovery queue:
volume recovery-queue purge-all -vserver <vserver_name>
View solution in original post
That's it! Thanks for the reply Jcolon...!
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/Free_Aggregate_space_is_not_returning_after_deleting_Volumes <-I created a KB for this issue to aid anyone else.