The supplied sources are a post about an unofficial multiplayer mod and a Steam community discussion asking about multiplayer or co-op. They should not be read as confirmation of an official multiplayer feature.
Separate official features from mods
Check the game's current official store page, news, and patch notes for official feature status. A community mod has its own setup, compatibility, and support boundaries.
Evaluate an unofficial multiplayer mod carefully
Read the mod's installation instructions, supported version, and known limitations. Back up your save before testing it, and do not assume that a single-player save will remain compatible after mod use.
Set expectations with co-op partners
If you try an unofficial solution, agree on game version, mod version, host setup, and backup steps first. Recheck the mod page after each game update.