Yes, it is. I feel like this hack is a wry nod to the old warez scene where multipart archives within archives were, for some reason, de rigueur.
No way to resume BBS and later FTP uploads back in the day.
I thought it was assumed that the files, once downloaded, would be distributed locally on floppies. The sub-archives were usually 1.44MB to fit on a 3.5".
When did resumable BBS download protocols become a thing? ZMODEM at least was widely used by the early '90s.