That's the correct way to relock your bootloader. Just follow the output lines in your cmd after executing fastboot oem lock.
Thank you for the input. My bootloader was locked so the lock commands just reported this. When I ran the subsequent commands I got an error about unable to flash (bc the bootloader was locked)..... I thought maybe the original post had a typo so I switched to two "unlock" commands as the first commands. This unlocked me, and all the subsequent commands completed OK, including the final lock. But after setup I still have the System Integrity msg when I check for s/w updates under System menu.
The original post was from 2020 so possibly my version of Magisk (24.3) is the cause.?
I have most of what I want; latest stock ROMs and phone is rooted... just want to clear the problem with s/w updates.
I found another command set that that flashed the boot, system and oem twice.. I have cut these commands below. Unfortunately I don't recall where I got the bat file. It was called FLASH_OEM_LOCK.bat. Again these commands issue a lock command followed by some flash cmds which I thought would not work with the bootloader locked? Does a lock command not take effect until after reboot or something? Anyway, here they are:
fastboot oem lock
fastboot oem lock
fastboot flash oem oem.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash system system.img_sparsechunk.8
fastboot flash system system.img_sparsechunk.9
fastboot flash vendor vendor.img_sparsechunk.0
fastboot flash vendor vendor.img_sparsechunk.1
fastboot flash boot boot.img
fastboot oem lock
fastboot getvar max-sparse-size
fastboot oem fb_mode_set
fastboot flash partition gpt.bin
fastboot flash bootloader bootloader.img
fastboot flash modem NON-HLOS.bin
fastboot flash fsg fsg.mbn
fastboot flash dsp adspso.bin
fastboot flash logo logo.bin
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash system system.img_sparsechunk.8
fastboot flash system system.img_sparsechunk.9
fastboot flash vendor vendor.img_sparsechunk.0
fastboot flash vendor vendor.img_sparsechunk.1
fastboot flash oem oem.img
fastboot erase modemst1
fastboot erase modemst2
fastboot erase cache
fastboot erase userdata
fastboot erase DDR
fastboot flash fsg fsg.mbn
fastboot oem fb_mode_clear