Can Mac system updates recover accidentally deleted kernel files? We commonly know that system updates will fix the kernel defects that have been discovered or not previously disclosed, to make the OS more secure.

However, what if I accidentally deleted some kernel files, will a new system update recovers the kernel files I deleted?
System updates (on any system) only modify targeted files which need improvment or removal.

They might accidentally repair a file you have damaged.
They might also accidentally damage a file you have fixed. But this isn't their target.

A full install will of course reinstall any file you removed.