I would wager that the ODHs have been signing a 6-monthly declaration only on their platform safety cases, which now exist. Whether their advisers would inform them that one of the components (the seat) was supposed to have its own "subsidiary" safety case I have no idea. Since fast jets tend to have little in the way of resilience or redundancy, the availability of an ejection option tends to feature highly in platform risk mitigation measures.... ooops.