Fixed the link thanks. I think for pure dev work the ultra-wide will ok, but the( or a ) 4K will be more future proof (studying BIS Multimedia)
Sure, it will be OK for purely dev, it will be slightly less OK than
this for example.
Especially for web dev, where I work best with my dev env, browser and dev tools open at the same time on the same screen, resolution is king. You get exactly the same kind of productivity/enjoyment on a 24 and 34" display if both of them are effectively full HD, and if the 24" offers more pixels than the 34" (as the one I linked), the 24" will be better.
For gaming, movies, or something else where immersion is more important, then the widescreen would be the better choice.
That said, if he is still a student, having the best is not that important. At the office I still work with 2 x 1080p. I would wager that most others in the industry do as well.
I remember during my studies I HAD to have that R3000 graphing calculator. Which I used for 10% of the questions in one exam. Best waste of money ever.
As for being future proof, it is nice and all, but don't overspend now if you don't have to. He will most likely get a job instead of working freelance. There he will get what he needs to work, no need to take his own.