There are two old Stats pages and they are both available from the classic dashboard. You can go directly to the classic dashboard by logging in here:https://wordpress.com/wp-login.php?.
The old Stats pages are
1. https://YourWeirdWebsiteName.wordpress.com/wp-admin/index.php?page=stats (really old, “classic”). Link is found in the dashboard admin panel in the “Dashboard” drop-down menu (clock symbol).
2. https://wordpress.com/my-stats/ (kinda old, “super classic”). The link is found in the dashboard navigation menu, in the website title drop-down menu.