Please elaborate, first time I’m hearing of this!

Well that's just a fact, everyone knows that

I know absolutely nothing about F1 or any of its racers and I could tell Prost was getting assassinated

That said I do think it was the filmmakers' intention to ground the experience as if you were viewing it from Senna's perspective, so them vilifying him is a method to achieve a sense of Senna's subjectivity vs. an objective stating of facts and reality