>I have no idea where this is headed.
Into the future as has always happened.
>For whatever reason, media.8kun.top is no longer in the phone book
Not exactly. The 'name' is pointing to an out of service number.
>What confuses me is why 8kun.top works but media.8kun.top does not.
8kun.top points to other 'numbers' that media.8kun.top does not.
Feel free to verify yourself. Don't take my word for it… go find out. Then use some 'trusted only by you' DNS checking tool to double check. Then lookup what a CDN is when you get bored.
>https://dnschecker.org/#A/8kun.top
>https://dnschecker.org/#A/media.8kun.top