As I interpret your screen shot, that is a classic pop-up page, not a push notification such as those you see popping out of the upper right hand corner of your screen when you get a new email or text....as such it won't be affected by the new 12.1 change.
Freedom is never free....thank a Service member today.
It's an ongoing war between the website programers and the web browser programers....as browsers become more capable of blocking unwanted website activities such as pop-ups, website programers develop new ways to circumvent those blocks.
"May you live in interesting times."
Freedom is never free....thank a Service member today.