I think there are some confusing language used here and on some linked website.
Skyteam-branded lounges are only available so far in YVR, SYD, IST, SCL and DXB. Before Covid, we had also LHR and HKG. They will eventually reopen in the future. SCL SkyTeam lounge is not the former DL SkyClub, it’s a different lounge, although DL SC has of course closed as a consequence of the opening of the ST lounge. There’s currently no new Skyteam lounge scheduled AFAIK.
The ORD lounge in T5 will be a “regular” DL SkyClub which will be accessible and used for all ST carriers flying from T5 (AF, KL, AZ, KE, etc). So it’s not a “Joint Skyteam SkyClub”, but a “regular” DL SC.
This is the same situation as CDG where AF lounges in 2F or 2E are used by all Skyteam carriers present in those terminals. Those are AF lounges and not Skyteam lounges.
The same situation as ORD T5 may also happen in BOS term E. It is possible that the AF lounge will close when the brand new DL SC will open in E.