If you see that value change in an update, that should catch your attention. For all AUR packages, you want to ensure that the source is pointing to the official URLs.
An deletion request would have to be reviewed and decided upon by one of the Arch maintainers.
It’s nothing a regular user could enforce.
That being said, if a user files a deletion request without a justified explanation, its unlikely that it’s actually going through. And including links to youtube videos including stupid comments is just spamming / trolling.
I wouldn’t even call this probing for an attack. The activities are clearly stemming from individual AUR accounts and I’m certain that these accounts could be easily suspended to avoid further shenanigans from their side.