Systemd founder and lead developer Lennart Poettering announced the creation of a new company called Amutable. The Amutable company being led by Chris Kühl (CEO), Christian Brauner (CTO) and Lennart Poettering (Chief Engineer) will be focused on delivering determinism and verifiable integrity to Linux systems.
In this context it’d mean something like “the actions of the binary are immutably liked to the spec”