The IO never mentioned he was arrested. He was detained.
Arrest and detention may be the same thing in this matter. It is just that the maker of these form
can not exhaust all wordds. It is just like N400 ask if you have been charged,
you can not answer No if you have been indicted by arguing that you were indicted but not charged. The same
thing for cited. One can get a citation but teh ticket is officially called summon and there is no word "cited"citation" on the
summon ticket. One can not use that as an excuse to say "I have never been cited".
It also depends upon how the OP applied for asylum. If he gave teh reason that he was arrested/cited for political reasons
in his home country but leave arrest/detent out in teh crminal history part of the application form, the USCIS may still
approved his aslym by overlooking inconssitency but now they may catch this incosnsiitency.
This may or may not be an issue. If the examination of crminal history is to determine that the applicant is not a common
crminal, USCIS may forgive you if later they find you did not disclsoe yoru arrest and then fidn arrest if because
you held a peaceful pro-USA rally in an anti-USA country.