I think the latest sbbs.service file has good instructions and the wiki page should refer to this file in gitlab rather than have a slightly different version of the file/instructions.
--- SBBSecho 3.20-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)
From Rob Swindell@1:103/705 to GitLab issue in main/sbbs on Thu Feb 9 00:59:44 2023