This ifixit article says, "Once again, the keyboard assembly is riveted down. Though the switches are likely less vulnerable to crumbly assailants, the keyboard itself isn't any more repairable than the Butterfly boards."
That directly contradicts statements from Apple to The Verge. https://www.theverge.com/2019/11/13/20962380/apples-16-inch-...
"Apple says that it has done extra work to stabilize the keycaps, made them slightly smaller so there’s more space between the keys, and that if a key breaks you can just replace that one key without taking apart the whole laptop."
This seems like a strange thing for Apple to lie about. What's the real truth here, I wonder?
EDIT: It seems that ifixit is just wrong about this, and the keyboard is at least somewhat more repairable than the butterfly model. The keycaps are replaceable (allowing you to spray compressed air directly onto debris) and the white part of the switch is replaceable.