Apologies, Jan. First time poster.
I don’t think it matters. Clearly there’s a fundamental problem with the site, something I wouldn’t wish to waste your volunteers’ time with.
I don’t think I can post it here but having looked through it it’s definitely a measure to get past a problem with wp-config.php at the outset (several years ago).
As below, named setup-config.php
[ Lengthy unreadable code deleted ]
I’ve only a superficial understanding of WordPress and so nervous about trying any of the above. However this process has highlighted that the site has no wp-config.php file, instead there is a piece of code that seems to have been written to compensate for the original web designer’s inability to create the file when establishing the site. Is this something that needs to be addressed before trying anything else?