>they seem to be recent pictures which have been photoshoped to look like glass plates:

If you click Tomas's name and scroll down some you see on his profile "Photographer Tomas van Houtryve captured the 19th-century grotesques, or chimeras, with 19th-century equipment: under a dark cloak, on glass plates, with a wooden camera he picked up in a Paris antique shop."

https://www.nationalgeographic.co.uk/photographer/tomas-van-...

He's a modern Belgian documentary photographer using period equipment.