Board Thread:Help!/@comment-26944294-20150830230800

I've been reading TARDIS wiki for several years now. I come to it to read the biographies and cast & crew lists for the different stories.

I noticed this week that many actors, directors, etc. who had previously had their birth dates, death dates, etc. listed on their pages have had them deleted.

For example, Graeme Harper, Dudley Simpson, Damaris Hayman and many others who previously had their dates listed, now seem to be deleted.

What is the reason why dates which have always been on these profiles before have been deleted?  