I would say that is just speculation and rumors. McLaren said both Zak and Stella are on multi year contracts so we are to believe Stella was signed for 2028 or 2029 in a Ferrari where you don't know how politics will work.
Clickbait by the sounds of it.
One "pundit thas is close to the team" says something and the internet goes batshit crazy. And these F1 site have a strong FOMO sindrome