aapanel_power SSH shows it's working. But on WordPress no plugin can detect Memcached or Redis.
The issue was, I had set website to use PHP 7.4 but inside WordPress, it's showing PHP 7.3. That is so strange considering that aaPanel is showing the website to be using version 7.4.
So, I had redis and memcached and APCU installed on version 7.4 yet WordPress is showing version 7.3 which I had not installed the php extensions.