I’m like 75% sure they can use ADB sideload to run scripts, if it’s fixed by a fsck couldn’t they write that into an OTA.zip and sign it with their key so devices will run it? Then all users would have to do is plug it into a website similar to the Pixel Flash Tool they have and boot into fastboot.
I’m not an Android dev, I’ve just installed my fair share of ROMS and I’m just throwing stuff out there and seeing what sticks. Feel free to tell me I’m wrong and a moron