Thanks for using Cloudera Community. Based on the Post, Your team deleted data from 100+ Tables yet there is no change in Disk Usage. It's likely Compaction must run first before any Space Usage reduction is reflected. There isn't any way to manually run Compaction in Kudu.
Review Link  Section "4.10 RowSet Compaction" reporting "We take this opportunity to remove deleted rows".
"There is no way to run compaction manually, but dropping the table will reclaim the space immediately."
You can verify the size from CM graphs:-
Go to the Kudu service and navigate to the Charts Library tab.
On the left-hand side menu, click Tables to display the list of tables currently stored in Kudu.
Click on a table name to view the default dashboard for that table. The Total Tablet Size On Disk Across Kudu Replicas chart displays the total size of the table on disk using a time-series chart. Hovering with your mouse over the line on the chart opens a small pop-up window that displays information about that data point. Click the data stream within the chart to display a larger pop-up window that includes additional information for the table at the point in time where the mouse was clicked.