Update: I have tried to MANUALLY delete the _wc_session rows from my database using the guide outlined here: https://www.remicorson.com/too-many-wc_sessions-in-woocommerce/
However – The database entries still remain. It stated at the end of the process that 543,496 rows were deleted (Query took 28.8822 seconds), but when I access phpMyAdmin the row count is still over 500k and the entries for _wc_session still remain.
I am at a loss. I have no idea why this is happening.
UPDATE: The rows are now gone, but the count (500k) still remains. I am not sure why this is.