Last modified: 2012-06-14 17:43:00 UTC
Administrators can view hidden filters themselves, e.g. here: https://en.wikipedia.org/wiki/Special:AbuseFilter/341 But they are not able to view the complete history of a hidden filter, or each individual "diff" (for want of a better word) of a change to one, e.g., the "details" link in the Abuse filter log: http://en.wikipedia.org/wiki/Special:AbuseFilter/history/341/diff/prev/9458
http://en.wikipedia.org/wiki/Special:AbuseFilter/history/341 That was from clicking the back to filter history link on the second link you provided - is this what you are looking for?
Yes, you can view that because you are in the edit filter manager group. I filed this bug because of the disparity for administrators alone - it seems odd that they should be able to view an entire filter, but not its history and changes made to it.
Gerrit change #10574
Bug assigned to code submitter.
Change merged, marking bug as RESOLVED FIXED.