I read the article! but I watched the movie a few days ago and Britney isn't in it. They just play that version of Toxic in an important scene towards the end.
my best guess is that someone misinterpreted the actress saying "britney is in it"
not truly related to this topic, but netflix is going to release a movie about guardianships with Rosamund Pike as the lead. Maybe when it releases we can use it to spread awareness about it and Britney's situation, even if the movie is a satire. It looks pretty good