The official Saints Row website has put an new post on their News blog mentioning that an patch is planned for November that should hopefully fix co-op, and includes the announcement of multiple FREE packs for all players (plus more for Expansion Pass holders), as well as Volition's plan for releasing Story expansions in 2023!

The free cosmetic packs will start releasing as of later this week (as of writing), with the "Front to Back" pack being first - which includes the Hollybird car, meaning that vehicle will be allowed for DLC runs as soon as the pack is available! (All other packs that include weapons or vehicles will still be part of the DLC category - whether free or from the Expansion Pass.)

Here is the link: https://saintsrow.com/news/autumnupdate

Edit: the "Front to Back" cosmetic pack is out now! I have updated the DLC document to include the Hollybird.