Stating the obvious, no, this interview doesn’t point to previous reports of Jamie Foxx being cast as Electro in Spider-Man 3 being false, as it was initially reported by The Hollywood Reporter, a reliable entertainment outlet.
In an interview with CinemaBlend, Sean O’Connell spoke with Jamie Foxx about his involvement with Spider-Man 3.
When Foxx was asked whether this would be a new or continuation of his character from The Amazing Spider-Man 2, he was evasive in his answer and gave nothing away
“You’re absolutely right, I can’t speak on it. But if I’m in it, I’ll be so happy.”
The same can be said of Tatiana Maslany, who outright denied that she had been cast as Jennifer Walters in She-Hulk, which was also reported by another reputable trade outlet, Deadline. Maslany actually said that her casting as She-Hulk was “not actually a thing,” despite showrunner Jessica Gao confirming the Deadline report with a retweet: