I think this is the same bird referred to in these observations:
It is also referred to on this post on birdnet (https://www.birdforum.net/threads/help-needed-to-identify-a-couple-of-water-birds-lake-geneva-at-geneva-switzerland.420270/), so pretty comfortable with this ID. If anyone can get it narrower though, be my guest!
Better photos of this observation: https://www.inaturalist.org/observations/161668688, taken the following day.
Pelecanus onocrotalus