Could be something could be nothing, but the age and date of arrival tally with DOBish, might explain where he had been:
Gustav Heise aged 50 / Locksmith
Birth: Germany
Depature port: Corral Chile
ports of voyage
Corral, Valparaiso, Callao, Puerto Chicama, Guayaquil, Buenaventura, Crist=Bal and Curacao
Arrived Liverpool 11 June 1936
Name of Ship Boskoop
Shipping Line Royal Netherlands Steamship Company Ltd