Yes and no. The publication itself is reliable, but they recently hired El Mayimbe, whose track record is spotty at best. He's had "scoops" in the past about THIS PARTICULAR CHARACTER that have been 100% wrong, so take the news with a grain of salt.
Back when Suicide Squad was being cast, he said that Joe Mangianello had been cast as Deathstroke and there was this scene-stealing moment in the film where Slade takes out the whole team single-handedly. Then he said JM either turned down the role or WB decided to "go younger with the character" and cast Jim Parrack. All of it turned out to be BS.