The problem is that to remove the openmode-warning with disclaimer-cal you need to do that before booting into openmode, because it is stored in a memory location hat is no longer accessible in openmode
The reason the kernel string in uname looks exactly like in the closed-mode kernel is because I made it so If the kernel version string had changed, then you'd have to copy in new modules too. Now as it is the openmode kernel works as a drop-in and uses the same modules under /lib/modules/