Q3181373 "John Douglas", description "Anglo-Australian politician and Premier of Queensland"; P31 (instance of) = Q5 (human); P569 (date of birth) = +1828-03-06; P570 (date of death) = +1904-07-23; P19 (place of birth) = Q84 (London); P20 (place of death) = Q556632 (Thursday Island).
Fetched from the Wikidata entity data JSON. P31=human and both dates match the tree record exactly, which is why wikidataQid is being set on the person.