Well it’s different as in this case it’s translated from a Cyrillic alphabet. Also, I would be surprised to read Köln in English as an English name exists for the city: Cologne.
This is not transliteration. It would be "pyotr" then. This is just using a German letter in an English text based on a purely visual similarity to a Russian letter.
This is wrong on so many levels...
I do not know where the inspiration cam from but that e with inverted commas is not a German letter
I have to admit: no idea as well.
So? I'm going to transliterate stuff from Russian with ё from now on, it just looks great. A language is whatever we want it to be, after all