Since EA Support is unresponsive:
For those that are having CTDs with the Battlefield 6 splash screen. Meaning you boot the game, Javelin Loads then boots the Battlefield 6 game to the black splash screen. Someone in the forums has found the error, the post I can not find now, but Javelin is not communicating with Battlefield 6's license/entitlement. Meaning that Javelin can not verify that the game is legit. Apparently from what I can see in the forums this is affecting all different kinds of variations of PCs. This is why none of the fixes have worked for this. Secure boot, boot drive configuration, changing security properties, etc. The anti-cheat is the current problem, hoping that this post can gain some traction so EA can look into the issue. For the time being I have refunded the game on Steam until the issue is resolved.
I've post this myself in another forum. It did not gain any traction on my post. Unfortunately the only fix I have found it to create a local admin and play the game that way. Unsure if this will work though as my game was refunded. Maybe EA will patch this and fix it, I have my doubts as they did not fix it with the Beta.