I have installed /e/ OS successfully but keep having these warning messages at each restart.
Would it be possible to remove them or skip the Samsung verification?
Correct – if it is not included in the install instructions please do not attempt to to relock the bootloader. Currently ~95% of /e/ ROMs do not support locking … and not you cannot skip verification sanely as far as I know.
I had the same problem and the way you propose to solve it is not very serious because you change the warning but the device is very vulnerable.
This is to put patches but not to seriously solve the problem. If you want to fight google with that the war is lost.