Most likely not. 'Suburban Screams' is probably a blend of real and made-up elements to create an entertaining narrative. It's common in this type of storytelling.
It's hard to say for sure. Some of the elements might be based on real events, but there's likely a lot of fictionalization and exaggeration to make it more dramatic.
When it comes to a 'phineas and candace lemon fanfic', it could also be a way for fans to express their own feelings about the characters. Some might write it to show their love for the show in a different way. It could be that the 'lemon' part is just a catchy way to make the fanfic stand out, or it could actually involve some sort of tangy or unexpected elements in the story.
Most likely not true stories. Suburban Screams is likely a product of imagination and creative writing. It could incorporate themes and tropes that are familiar, but that doesn't mean it's based on actual events. The purpose is to entertain and captivate the readers/viewers.
I'm not entirely sure of a specific story directly between them. They come from different areas of the public sphere. Eminem is a famous rapper known for his music and controversial lyrics. Candace Owens is a political commentator. Maybe there could be some indirect connection in terms of cultural influence or reaction to certain social issues.