Delta Gold is STE+ so should have access to SkyTeam-operated lounges.
https://www.skyteam.com/en/about/faq/lounge-access/
"International First and Business Class passengers, as well as SkyTeam Elite Plus members traveling in Economy Class, enjoy complimentary access to more than 629 worldwide member lounges on the day of travel when flying on or connecting to or from an international flight operated by a SkyTeam carrier."