From the article:
> I do not mean the disheveled unconventionality often ascribed to him—I mean “Bohemian” with a capital B.
Re:When Einstein Was Bohemian
by GrantZvolsky on Friday February 21, 2020 @04:31PM
(#22387015)
The article doesn't really explain the difference merely saying Bohemia is a historical kingdom.
[1]: https://en.m.wikipedia.org/wiki/Romani_people#Exonyms