[EDIT, 15 June, 2023:] Since I wrote this blogpost, with the image above, the following note has been added to the OProM website:
Although the title of the organiation is in French -- "Organisation pour la protection des manuscrits médiévaux", abbreviated as "OProM" -- the website is available in both French and Italian, and Italian appears to be the native language of the unnamed person behind the site, to judge by the use of Italian URLs and image captions.