According to DL, if it's in economy, then those tickets do translate to basic eco.

"SkyTeam Elite Plus customers (excluding Delta Medallion Members) traveling in any cabin on a SkyTeam international flight* or a SkyTeam domestic flight connecting to/from a same-day international flight (includes same-day travel on a Delta domestic flight connecting to an international Delta –or any other SkyTeam partner—flight) will receive Delta Sky Club access with up to one guest. Effective January 1, 2024, all customers traveling with Basic Economy tickets (or similar "light" or "basic" tickets on a Delta partner flight) will not have access to the Delta Sky Club. If traveling on an international* itinerary, please show a frequent flyer credential representing SkyTeam Elite Plus qualification for lounge access."

key phrase - "or similar light/basic tickets on a DL partner flight"