Is the class explicitly about Julia? Based on my experience, I would have expected there to be a data science class that incidentally required (and helped) you learn Julia along the way. Back when I was at MIT (shortly after a couple Course 12 grad students invented dirt), I don't think any classes were explicitly about single languages. 6.001 was teaching fundamentals of computing, and used Scheme to get there, but wasn't a class explicitly about Scheme. Likewise, 1.00 was how I learned C, but in the context of Civil Engineering problem solving.
There was an IAP seminar for a crash course on TCL/Tk and another IAP seminar crash course on Java, but neither of those were taught by professors nor yielded any units.