Would they have shared your non-anonimized data with anyone by the time you request a delete? Perhaps through some unspecified 3rd party whose privacy policy you don't know?
This was a few years ago, so it could have changed. Supposedly they only shared 'anonymized' data for research purposes. You could opt-in (or maybe out) of genealogy connections. Of course, with enough attributes and cross references even anonymized data is seeming less and less safe.