Deletion of Piers Lauder

Comment: There are countless bios on WP which simply do not have "multiple" sources, some lucky to have one. So why is this AfD so important? And where in  does it state that an employer's public comments on their staff is unacceptable as source materiél? Also, are you saying that the two-centuries old publications of Burkes, Kellys, Debretts, et al, (which are not just "directories" aka a telephone book but potted biographies of those contained therein), are no longer acceptable source materiéls? I have now added two further on-line references (having seen elsewhere on WP where people have complained about the lack of google hits on a subject
Stance: comment
Cited policy: Wikipedia:Notability (WP:BIO)