Quick update on what I have done and what results I have seen for future reference and to assist others:
WooCommerce Report Clear Deleted Orders
- Made various test orders
- Viewed the WooCommerce Reports display and ‘orders placed’ count
- Deleted orders and sent them to the Trash
- Viewed the Trash and clicked the ‘Empty Trash’ button
- Viewed the Reports display again and see that the ‘orders placed’ count has not been reduced as expected
- Tried navigating to WooCommerce -> System Status -> Tools tab and using ‘Clear Transients’, ‘Clear Expired Transients’ and ‘Clear all Sessions’
- Returned to the Reports display and see that the information as STILL not been updated
So long story short, perhaps there is some other sort of cache involved or there is an automated update process that happens at a scheduled time to clear? My removal the other day has updated but the test case I just described has not so if anyone has any idea on when the clear happens and what forces it please let me know.