You edited MediaWiki:External image whitelist and Manual:$wgAllowExternalImages#Example in 2011. The example image is currently not shown. Manual:$wgEnableImageWhitelist says Default value true (prior to 1.32) false (1.32+). According to MediaWiki 1.33/wmf.2#Core changes it actually changed in 1.33.0-wmf.2. MediaWiki 1.33/Roadmap says it was deployed Tuesday, 30 October 2018. https://web.archive.org/web/*/https://www.mediawiki.org/wiki/Manual:$wgAllowExternalImages confirms the image disappeared somewhere between 17 August 2018 and 22 January 2019, the closest snapshots to 30 October 2018.