Not all Workshop languages are taught immersively. Languages with no on-campus immersion and no study-abroad immersion are taught online.
Like all Workshop courses, these classes are accelerated and intensive and are focused on providing communicative competency in the new language in a short time. Online students participate in 20 hours instruction a week (or more, depending on the language) and cover 2 semesters of instruction in 2 months.
Each course is unique, so check the individual language page for details on the languages that interest you.