As above really, without knowing the standards of the tests in japan at that time I do doubt they where crashing ek civics at track speeds.
When I crashed my first 9 I bent an fia legal seat mount (3mm steel iirc) by quite abit.(bucket seats where fine) but that shows the forces at play.
Saying this I'd still rather sit in an ek9 recaro than a rep or untested bucket seat.
I think you'd have to be unlucky, the crash would have to be at the right angle I think, come to think of it i vaguely remember a video of someone crashing at brands in a Honda and his passenger come straight out the seat iirc.