Age of Empires III: Definitive Edition’s DLC has been delayed for a unspecified date.
Age of Empires III released in 2005, and is no longer on sale after 19 years. This has been confirmed by a message on Steam page of the remake, Age of Empires III: Definitive Edition, released in 2020.
“From today, Age of Empires III (2007) will no longer be available for purchase.