Actually, "burg" means "walled town" or "castle" (there has to be some form of protective structure). However, the words "berg" and "burg" are closely related and in very old names it is not always possible to distinguish between them
If he didn't have input from China, then he created it independently and qualifies as its inventor even though he wasn't the first to invent it. He's separated enough in space and time and his press was different than the Chinese invention
You should allow Koenigs- for Kaliningrad. With a US or UK (etc) keyboard it's hard to type the o-umlaut. I guessed you might allow Konigs-, which sensibly you do, but it's not actually correct.
This is historically inaccurate since the printing press was first pioneered in China 3 centuries earlier.
;)
While on the subject. including -burough wouldnt be farfetched. Attenburough really wants to be on here ;)