My thoughts precisely.
Well it sure doesn’t look like it is very secret. Probably because other countries with their satellites can see this stuff going on.
Still somewhere there must be a fuller report. If they ran 20 Aegis tests and 19 of them shot down the test missile, then that explains the “5% failure.”
But without knowing what kind of configuration would actually be set on guard, that doesn’t tell the whole story. Maybe Aegis was only allowed to shoot one projectile for each test. In which case, being able to shoot twice would work even better.