What doesn't appear like an April's fool about BER.... However, the Bild newspaper insists in an updated article that this is not an april's fool joke. They claim that only 4% of listed issues have been fixed over a 6 months period. They say sources suggest there are two options: 1) Strip out the entire interior of the airport and re-do it. 2) Demolish the entire thing and start from scratch. Reason for both of the above is that no building plans appear to exist that would help to understand the current built infrastructure. (I know. Continues to sound like a joke.
BER-Debakel ist kein April-Scherz: Riesen-Wirbel um BILD-Meldung - Politik Inland - Bild.de)