The Hemi was never going to be an option in the Charger, but your dates are about right. The only engine options for the Charger outside the EV was the standard output I6 or the high output I6 and both weren’t supposed to be available until after the EV was rolling. They have move them up along with the Ramcharger truck, but nothing I have seen mentions the Hemi.
I’m not saying I know anything about what the factory is going to roll out, but I haven’t heard anything about the Hemi being an option. I have seen comments about them working on a new V8, but even that is so light on info that it doesn’t even have to be a Hemi.