I counter same problem a few days ago, I found that the xf_data_registry table was sized above 20GB and delete all unreadPostCount rows but xf_data_registry table was increase 5GB after a few hour again so i uninstall this addon alos MySQL requirements also inflate the database, CPU, and RAM...
[18-Apr-2021 03:18:21 UTC] PHP Fatal error: require(): Failed opening required '/home/domain/public_html/forum/library/XenForo/Autoloader.php' (include_path='.:/opt/cpanel/ea-php73/root/usr/share/pear') in /home/domain/subdomains/domain.net/member.php on line 11
How can i solve that