Hi Gleb and welcome to the forum!
I have a list of scorpion species in Spain on my site that I suppose needs updating when I see you mention a name change sigh! https://wildsideholidays.co.uk/spiders-scorpions-and-centipedes-in-spain/ To be honest I have never finished the scorpio articles. Can you provide a link for info on the name changes?
Finding is a question of patience I guess but over here in Grazalema they are pretty easy to come across most of the year apart from when it gets really hot. Then, I think they retreat down their burrows a bit further. Maybe thats the reason you didn’t find one in your searches so far.
Nice duck! 🙂
Some info about those pesky sliders here: https://wildsideholidays.co.uk/invasive-species-the-red-eared-terrapin/