Nope, the issue that I reported is something different.
The overarching ‘motherblog’ is still there and operational. However, all underlying network sites have disappeared. The dashboard doesn’t show them anymore, plus that in the wp-config.php file, all network site setting have been erased:
Current dashboard set up: https://www.dropbox.com/s/dw6cddzsdiavttk/WP01.jpg?dl=0
Current wp-config.php file settings: https://www.dropbox.com/s/pqnpkg65qb38f61/WP02.jpg?dl=0
I find a kind of sad, that WordPress support shines by absence, from the mment that I reported this…